Lake Peipus, the fifth-largest lake in Europe, dates back hundreds of millions of years to the Paleozoic Era and is known for its sand dunes, which can "sing" when the wind blows just right. In the winter the frozen lake surface may feature ice hummocks, as seen in this image. The hummocks are caused by slow, uneven pressure in the ice pack.
Lake Peipus, Estonia
Today in History
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The largest American bison around
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Headed to the High Country
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Dusky eagle-owls, Pakistan
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Mount Fuji Day
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Take the Stairs Day
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Go with the rainbow flow
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A big birthday for Big Bend
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Southern lights for Antarctica Day
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A look at Uranus, seventh planet from the sun
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Walking among the giants
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A lofty lighthouse and a little ocean spray
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Discovery Day in Yukon, Canada
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Ruins of a royal temple
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Piazza IX Aprile, Taormina, Sicily, Italy
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The Hermitage of Santa Justa
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In the Himalayas for International Mountain Day
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Tafilalet oasis in Morocco
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National Bison Month
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Moai statues on Easter Island, Chile
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A midsummer twilight s dream
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Welcome to the Year of the Pig
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Happy Astronomy Day!
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Point Reyes National Seashore in California
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Playa del Amor, Marietas Islands, Mexico
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Sea Otter Awareness Week
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National Llama Day
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Bow Bridge in Central Park, New York City
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Take me to the river
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Bryce Canyon National Park turns 100
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Sunrise at Grand Teton National Park, Wyoming