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Mar 4, 2024Arenal Volcano, Costa Rica

Greetings from tropical Costa Rica! The conical Arenal Volcano rises to an impressive height of 5,437 feet, standing tall above the surrounding rainforest and Lake Arenal, the largest lake in the country. The sleepy mountain roared to life in a massive 1968 eruption that buried about 6 square miles under rocks, lava, and ash and devastated three villages. The last significant volcanic activity there took place in 2010, and the once lava-lit peak is currently dormant. With over 500 species of birds, Arenal Volcano National Park is a must-visit location for birdwatchers. The park is also home to a diverse range of flora and fauna, including red brocket deer, pumas, white-faced monkeys, orchids, heliconias, and ferns. Arenal makes for an imposing and beautiful sight, towering over the tropical trees.Desktop Version

Oct 29, 2022Sea Slug Day

Swimming into view like an oceanic Halloween specter, today"s "sea angel" is one of about 3,000 sea slug species. Sea slugs can be found in all the oceans and seas of the world. Scientifically known as nudibranchs, sea slugs are mollusks and today is the day the world celebrates them. What, you didn"t know? Perhaps that"s because technically it"s the birthday of the premier authority on all things related to sea slugs, Terry Gosliner. Gosliner has identified nearly half of the known sea slug species in the world, has written 150 scientific papers about them, and has personally named around 350 individual species. "Everything about them just piques the imagination," he says. So, we"re saying "Happy birthday, Terry" by taking a moment to examine the sea angel.Desktop Version

Apr 16, 2022National Park Week begins

Only a very small percentage of Yellowstone"s total visitors see the park when it looks like this. In winter, when the park grows quiet, its hydrothermal features really stand out, like the rainbow-hued Grand Prismatic Spring in the bottom center of this image, the most photographed feature in Yellowstone.Desktop Version

May 29, 2023Memorial Day

On Memorial Day, we honor the brave men and women who sacrificed their lives serving in the US military. People mark the day in different ways by attending parades, laying flags or flowers on the graves of fallen soldiers, and participating in community events.Desktop Version

Sep 21, 2022International Day of Peace

Today we"re marking the International Day of Peace, first commemorated in 1981, when the United Nations dedicated the day to "strengthening the ideals of peace, through observing 24 hours of nonviolence and ceasefire." This year"s theme is "End racism, build peace." As the UN says, "Achieving true peace entails much more than laying down arms. It requires the building of societies where all members feel that they can flourish. It involves creating a world in which people are treated equally, regardless of their race."Desktop Version

Jul 30, 2024San Gimignano, Siena Tuscany, Italy

These medieval towers stand tall over San Gimignano, a small town near Siena in north central Italy. In the Middle Ages, a town grew up around a church dedicated to St. Geminianus (San Gimignano in Italian). As well as being a popular stop for pilgrims on their way to Rome, the town prospered thanks to its trade in local Vernaccia wine and in saffron, which is grown in the nearby hills. However, when the Black Death struck in 1348, half the population was lost, slowing the town"s development and preserving its medieval character to this day.Desktop Version

Mar 11, 2024National Napping Day

Feeling sluggish from the effects of daylight saving time? Don"t worry, National Napping Day has you covered! This holiday, introduced in 1999 by Boston University professor William Anthony and his wife, Camille, promotes naps and their short-term benefits to mental alertness. Take a cue from today"s image; this sleepy koala may inspire you to catch some Z"s. These adorable Australian marsupials can sleep up to 20 hours a day, which helps them conserve the little energy they get from their eucalyptus-based diet. Koalas move slowly when awake, spend most of their time tucked into nooks in trees, and have a lower body temperature than other animals of their size. Let"s find some time today to sneak off to a peaceful spot to experience the benefits of Napping Day.Desktop Version

Nov 27, 2023Río Negro, Amazon basin, Brazil

From its source in Colombia, the Río Negro flows about 1,400 miles to become one of the largest tributaries of the Amazon River at the Meeting of Waters in Manaus, Brazil. It is also the largest blackwater river in the world, its water stained by decomposing organic matter that seeps in from swamps. These slow-moving, dark waters beautifully reflect the colors of the sky, including the rainbows which form over the Amazon basin, as seen here. The river also plays a crucial role in the ecosystem, as the home of many plants and animals, including the critically endangered Brazilian barefaced tamarin, the giant river otter, and nearly 700 species of fish.Desktop Version

Dec 5, 2024Tufa formations in Mono Lake, California

Shaped by the slow passage of time, tufa—a type of porous limestone—emerges as one of nature"s most spectacular formations. While these towers can be found in many places, today"s image shows some at Mono Lake in Mono County, California. These structures develop when calcium-rich fresh water, flowing into the lake from several creeks and streams, mixes with the lake"s alkaline water. Over centuries, this interaction caused calcium carbonate to build up, forming tufa spires above the lake"s surface. To preserve the tufa towers, the Mono Lake Tufa State Natural Reserve was established in 1981.Desktop Version

Jan 31, 2024International Zebra Day

It"s time for some black-and-white thinking. January 31 is International Zebra Day, celebrating the stripey creatures pictured here in Rietvlei Nature Reserve, South Africa. There are three species of zebra: plains, mountain, and Grévy"s, and several subspecies. The mother and foal on our homepage are Burchell"s zebras, a subspecies of the plains zebra. Found across eastern and southern Africa, zebras thrive in savannas, shrublands, woodlands, and mountain regions. They spend most of their time eating grasses, leaves, and shrubs, and can travel hundreds of miles in search of food and water. Sadly, all three species are under threat due to hunting and habitat destruction. International Zebra Day aims to raise awareness of conservation efforts, to help protect these striking creatures.Desktop Version

Nov 12, 2022Alaska Bald Eagle Festival

Each November as many as 4,000 bald eagles descend on the Chilkat River near Haines, Alaska, to feed on the late run of chum and coho salmon that have returned to spawn in the river flats. It"s a feast for birds and birders alike, as the raptors tear into a never-ending supply of tasty fish. The largest congregation of eagles in the world, it"s celebrated by the annual Alaska Bald Eagle Festival in the second week of November. The event features live raptor demonstrations, educational programs, guided hikes, and live music.Desktop Version

Mar 14, 2024Happy Pi Day!

They say the only constant in life is change. In mathematics, however, there are many constants and today, we"re celebrating perhaps the most famous of them all: pi. Represented by the symbol π, this tasty-sounding number is the ratio of a circle"s circumference to its diameter, approximately 3.14159. Every March 14, mathematics fans across the world get baking to mark Pi Day with a pie. It began in 1988, when physicist Larry Shaw connected the date (3/14) with the first three digits of π. Today, mathematicians and enthusiasts celebrate Pi Day with pie eating and pi reciting. Did you know that when your clock strikes 1:59 today, you will be three decimal places closer to the real value of pi? Pi is everywhere, even in nature. Pictured here is a bodhi tree which has grown over an arch into the shape of the pi symbol at Wat Phra Ngam, a temple in Ayutthaya, Thailand. Whether you"re a math geek or just in it for the treats, Pi Day is for everyone to enjoy!Desktop Version

Jun 6, 2022Indigo bunting

This time of year, from late spring to summer, male adult indigo buntings take it up a notch and turn a brilliant deep blue. They fly up to a perch—like our cheerful fellow atop a branch—and sing from morning to night to defend their territory from other males and to catch the attention of females. Indigo buntings are members of the "blue" clade (subgroup) of the cardinal family.Desktop Version

Jun 17, 2023International Surfing Day

International Surfing Day promotes the protection of the ocean alongside celebrating the sport itself, every year on the third Saturday in June. People gather for surfing contests, barbeques, beach cleanups, and other activities to help restore the ocean environment. Coming together for a cause is a hallmark of the global surfing community, whether campaigning for cleaner waters or standing together against injustice, as they did at the Paddle Out for Unity gathering in 2020 in Encinitas, California, pictured on our homepage.Desktop Version

Nov 5, 2022Tigh Mor Trossachs on Loch Achray, Scotland

Fairy-tale castle? Check. Stunning Scottish backdrop? Check. Calm, tranquil loch? Check. If Tigh Mor looks idyllic to you, you"re not alone. Queen Victoria spent time here in its heyday, and though the old hotel (it was built in 1849) declined over the years, a multimillion-dollar restoration has brought it right back to its former glory.Desktop Version

May 6, 2024The Roaches ridge in the Peak District, England

In today"s image, the sun encroaches on the Roaches, a rocky ridge in the Peak District, northern England. Its strange name comes from the French "les roches," which means "the rocks." Rising to a height of over 1,600 feet, the ridge is a popular destination for climbers and hikers in the Peak District National Park. It offers stunning views over the moorland and, if you"re lucky, you may spot a wallaby! A number of these Australian marsupials escaped from a nearby private zoo in the 1930s, and there are still recorded sightings of the descendants of the original wallabies.Desktop Version

Sep 5, 20242024 Toronto International Film Festival

Cinema aficionados, assemble. The Toronto International Film Festival (TIFF) gears up to dazzle with its 49th edition in Canada"s largest city, seen in today"s image. Since it began in 1976, the TIFF has become one of the largest publicly attended film festivals in the world. Attendees range from seasoned directors to rising stars and eager cinephiles and the festival has hosted premieres of many critically acclaimed films, including "The Fabelmans" and "Black Swan."Desktop Version

Aug 4, 2022Satla marshland in Bangladesh

There may be a more peaceful, stress-free job somewhere, but we wager that the farmers harvesting water lilies and gliding along the river in Satla, Bangladesh, might have that locked up. The flowers bloom during the seasonal flood from August to November, cloaking an incredible 15 square miles of wetlands in gorgeous, fragrant pink. The village of Satla, in the Barisal District of south-central Bangladesh, is known as the capital of "shapla," or water lilies, for obvious reasons.Desktop Version

Aug 13, 2022Boundary Waters Canoe Area Wilderness

In the mood for a quiet canoe ride? If so, consider a trip to Boundary Waters Canoe Area Wilderness (BWCAW) in northeast Minnesota. The Boundary Waters wilderness stretches for 150 miles along the US-Canada border within Superior National Forest. Known by those seeking solitude, Boundary Waters is one of America"s most beautiful and remote locations. Formed long ago from the scraping and gouging of glaciers, the area is distinct with its rugged cliffs, canyons, and thousands of lakes and streams. More than 1,200 miles of canoe routes are enjoyed by thousands of people every year.Desktop Version

Mar 25, 2024Happy Holi!

It"s Holi; get ready to become a walking rainbow and sprinkle joy wherever you go! This festival of colors, spring, and love is a cornerstone of Indian and Nepali culture. It is also celebrated in other countries with large Hindu populations, such as Bangladesh, Pakistan, the US, the UK, Suriname, Indonesia, and Malaysia. Festivities last for a night and a day, starting on the evening of the last full moon in the Hindu calendar month of Phalguna, which usually falls in March in the Gregorian calendar. As the sun sets, people gather to light bonfires, a ritual known as Holika Dahan, symbolizing the triumph of good over evil. The following day, the streets come alive with people splashing each other in colors, giving everyone a vibrant makeover. Are you ready for the hues of Holi?Desktop Version

Nov 5, 2022Tigh Mor Trossachs on Loch Achray, Scotland

Fairy-tale castle? Check. Stunning Scottish backdrop? Check. Calm, tranquil loch? Check. If Tigh Mor looks idyllic to you, you"re not alone. Queen Victoria spent time here in its heyday, and though the old hotel (it was built in 1849) declined over the years, a multimillion-dollar restoration has brought it right back to its former glory.Desktop Version

Oct 18, 2023Alaska Day

On October 18, 1867, the Russian Empire transferred the territory of Alaska to the United States of America as a result of negotiations by US Secretary of State William Seward. Referred to as the Alaska Purchase, the United States paid 7.2 million dollars, about two cents per acre, for the land. Today, that date is known as Alaska Day, a commemoration that honors the rich history, cultural tapestry, untamed wilderness, and unwavering resilience of the state.Desktop Version

Aug 25, 2023National Park Service anniversary

Though summer is winding down, it"s not too late to pack some gear and head into the great outdoors. Unsure where to go? Look no further than our 63 national parks, which exist thanks to the National Park Service, created on this day in 1916 by President Woodrow Wilson. He ordered the service to preserve the landscape, wildlife, and history of the parks "in such manner and by such means as will leave them unimpaired for the enjoyment of future generations." In other words, the park service was established for all of us! Just make sure that whether you"re visiting the islands of American Samoa, the glaciers of the North Cascades, the waterways of the Everglades, or the 308-foot Lower Falls of Yellowstone in today"s image, that you explore them with care and appreciation so that they can be preserved for centuries to come.Desktop Version

May 26, 2023Wat Sri Sawai in Sukhothai Historical Park, Thailand

Welcome to Sukhothai Historical Park, one of Thailand"s most spectacular UNESCO World Heritage sites. The park is dotted with ancient temples, the remains of a palace, and towering Buddha statues—within its boundaries is the historic town of Sukhothai, an important metropolitan hub in the 13th and 14th centuries. The name translates as "the dawn of happiness" and you can spend many happy hours here, strolling among the beautiful lawns, trees, and lakes. The temple on our homepage is Wat Si Sawai, one of the oldest on the site, founded in the late 12th or early 13th century. Sukhothai was the capital of the first Kingdom of Siam more than 700 years ago and this historic site continues to offer a window onto what is sometimes seen as a golden age of Thai civilization.Desktop Version

Nov 15, 2022River otters at Acadia National Park, Maine

You "otter" know something about the creatures in today"s photo. They"re a pair of North American river otters swimming in Maine"s Acadia National Park. Technically members of the weasel family, these "water dogs" aren"t just locked into rivers. They can be found in other waterways and along the coasts of North America. A myopic animal with eyesight adapted to help with swimming, river otters will come right up on humans or boats, usually within a few feet.Desktop Version

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