Explore the ancient caves of Hang Son Doong, Vietnam. Hang Son Doong is one of the largest caves in the world and features a fast-flowing underground river. For spelunkers, exploring Hang Son Doong is the equivalent of scaling Mount Everest.
The continuous Fly Geyser of Fly Ranch is on private land in Nevada and began during a 1916 water well drilling that accidentally penetrated a geothermal source. via Green Fly Geyser Fine Art Print - Inge Johnsson
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