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Inside a long straight underground mine tunnel, zoom in, The Museum of Mining in Pernik, Bulgaria
The Hotels and the beach areas of the northern Dead Sea - Vertical video
Visitors admire the unique travertine terraces and mineral deposits at Mammoth Hot Springs, enveloped in rising steam on a cool day in Yellowstone National Park.
Aerial view Natural travertine pools Pamukkale Turkish, spa terraces with blue water.
Close up shot of the famous blue flame phenomenon at Kawah Ijen volcano crater.

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