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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Rainbow Mountain
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Saint Nicholas Day in Verbier, Switzerland
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Village of Zahara de la Sierra, Cadiz, Spain
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A river on the tundra
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Its Halfway Day!
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Formal garden at Château de Villandry, Loire Valley, France
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World Reef Day
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World Elephant Day
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National Hummingbird Day
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Basking in the glow
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Leshan Giant Buddha, Sichuan, China
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South Stack Lighthouse, Holy Island, Wales
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All eyes on moths
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Midnight sun
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International Day for Biodiversity
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Ubud, Bali, Indonesia
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Evidence of human habitation
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Jöriseen lakes in the Silvretta Alps, Switzerland
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Computer Science EDU Week
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Where the glow of the holidays lingers
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Ostuni, Apulia, Italy
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Happy International Beaver Day!
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A little bit of Wonderland in New York City
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It’s surströmming time
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Happy Syttende Mai!
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Red fox
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On the Route of the Waterfalls
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A wonderland in winter
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Does this shark have an Irish accent?
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Plum blossoms in China
Bing Wallpaper Gallery

