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The Arches That Salt Built
Published May 10, 2025
A layer of salt called the Paradox Formation played a crucial role in the formation of thousands of arches within Utah’s Arches National Park.
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Sand, Stone, and Sea Life at Dry Tortugas
Published April 26, 2025
The national park west of mainland Florida includes a smattering of islands, but the vast majority of the park’s acreage lies underwater.
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Moonscapes of Idaho
Published April 24, 2025
The volcanic features and otherworldly landscape of Craters of the Moon National Monument and Preserve are apt training grounds for planetary exploration.
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The Drumlin Islands of Boston Harbor
Published April 23, 2025
A national recreation area and state park protect an archipelago made of glacial debris in eastern Massachusetts.
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Mountains Made of Fossils
Published April 22, 2025
The peaks in Guadalupe Mountains National Park—some of the highest in Texas—are made of a well-preserved fossil reef formed more than 250 million years ago.
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North America’s “Galapagos”
Published April 21, 2025
The Channel Islands off the coast of southern California support diverse ecosystems, with some plants and animals found nowhere else on the planet.
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Relics of a Red World in Bighorn Basin
Published April 17, 2025
Folds of rusted rock neighbor the Bighorn Canyon’s deep scar in the western United States.
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National Parks Under Snow
Published March 30, 2025
Gateway towns in Wyoming and Montana flank the Rocky Mountains and provide an access point to Yellowstone and Grand Teton national parks.
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Lava Flows of the Sáttítla Highlands
Published January 20, 2025
This U.S. national monument, rich in geological and cultural heritage, displays Northern California’s fiery past.
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Bryce Canyon at Night
Published July 27, 2024
Visitors to this national park in southern Utah can witness geologic landforms by day and a celestial light show by night.
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A Geological Wonderland in Alaska
Published May 28, 2024
Braided rivers, landslide debris, and alluvial fans are spread across this dynamic landscape in Glacier Bay National Park.
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Escaping Home
Published February 17, 2024
Harriet Tubman preferred to navigate the woods and waterways of Maryland’s Eastern Shore on winter nights when guiding enslaved people north on the Underground Railroad.
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