Devetashka Cave, Bulgaria

Darvaza gas crater, Turkmenistan

Erosion on the slopes of a volcano near Ankisabe, Madagascar

Cathedral Cove, Coromandel Peninsula, New Zealand

Yosemite

Durdle Door in Dorset, Great Britain

Aldeyjarfoss in Skjálfandafljót, Iceland

Qaqortoq, Greenland

Natural Spring, Central FL, US

King's Canyon, Australia

Forest

Klyuchevskaya Sopka Stratovolcano in Kamchatka, Russia

Beatiful Kuang Si waterfall in Laos