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The mushroom cloud formed from the first hydrogen bomb explosion, code named Ivy Mike

The mushroom cloud formed from the first hydrogen bomb explosion, code named Ivy Mike, which destroyed the island of Elugelab in the Enewetak atoll. The United States tested 67 nuclear weapons during the period of the Cold War including Castle Bravo which was the largest nuclear test ever conducted. Marshall Islands, Micronesia

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The Spiral Jetty

The Spiral Jetty, 4.6 metres-wide earthwork sculpture by Robert Smithson, created in 1970. Its total length is 460 m. It was originally black from its basalt rock, and is now encrusted with salt. Near Rozel Point, Great Salt Lake, Utah, USA

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Abstract, Aerial, Art, Artwork, Coil, Coiled, Counterclockwise, Design, Dia Art Foundation, Encrustation, From Above, From The Air, Graphic, Installation, Lakes, Landscape, Pattern, Rozel Point, Saline, Salt, Sculptor

Gullfoss Falls

Gullfoss Falls, on the Hvita River that originates in a glacier lake. The falls plunge down a three-step staircase and thunder 32 m down into a crevice some 20 m wide and 2.5 km long. Hvita River, Gullfoss Nature Preserve, Southwest Iceland

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Europe, European, Fall, Falls, Freshwater, River, Rivers, Scenery, Scenic, Scenics, Water, Waterfall, Waterfalls, Waters