Arbor Day celebrates the quiet power of trees—the way they steady ecosystems, shelter wildlife, cool cities, and shape the environments we rely on every day. Observed in the United States on the last Friday in April, the day encourages communities here—and in many other countries, where dates vary according to growing season—to plant, protect, and care for forests of every kind, from neighborhood canopies to iconic wildlands.
Arbor Day
Today in History
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Here’s why landmarks are going dark
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Salzburg, Austria
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Via Krupp, Capri, Italy
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Ice and Snow Sailing World Championships
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All is silent for Big Ben’s musical milestone
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Celebrating sea otters
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European Day of Parks
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Where do those colors come from?
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Sunrise at Grand Teton National Park, Wyoming
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Find a Rainbow Day
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Killer whales in Spildra, Norway
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A Flag Day tradition
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A Latino art exhibition in Denver
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Diamond Beach, Iceland
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Salar de Uyuni salt flats in Bolivia
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Everest s shadow on the Himalayas
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A march toward a dream
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Happy New Year! (Again!)
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Papa was a flightless bird
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Diving into World Oceans Day
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Aw shucks, It s Oyster Day
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Stop and see the flowers
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A valley view at 9,000 feet
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Wheels up in Beijing
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A view from the top
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International Rock Day
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That bill s just not going to fit
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Waitangi Day in New Zealand
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Beware the Ides of March
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Bangkok, Thailand
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