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Explorers inside <n>Krubera Cave</n> in Georgia. Photo by <n>Stephen Alvarez</n> for <n>National Geographic Creative</n>.

An installation by artist <n>Anish Kapoor</n>.

<n>Tunnel</n> (1994) by artist <n>James Casebere</n>.

The <n>Richat Structure</n>, or Eye of the Sahara, in Mauritania. Photo by <n>NASA</n>.

Album art used by musicians <n>Tyxonsmith</n> and <n>9dreamz</n>.

Detail of <n>Robert Gober</n>'s <n>Untitled</n> (2003-05). Photo by <n>Charles Ray</n>.

<n>Neil</n> explores the <n>Paradise Ice Caves</n> on Mt. Rainier, 1980. Photo by <n>Mary</n>.

<n>Matanuska Glacier</n>, photographed by <n>Fred Kline</n> for his 1976 book <n>Alaska high roads to adventure</n>.

The <n>Mir Mine</n>, an open-pit diamond mine in Mirny, Russia, owned by <n>Alrosa</n>.

The <n>Devil's Sinkhole</n> in Texas, USA.

<n>Descent into Limbo</n> (1992) by artist <n>Anish Kapoor</n>.

The <n>Barringer Meteor Crater</n> in Arizona. Photo by <n>D.P. Cruikshank</n>.

The <n>Sedan Crater</n> at the <n>Nevada Test Site</n>, created in 1962 during <n>Operation Storax</n>.

Image via <n>ATLAS 🛰️ SATELLITE</n>.