Purnululu National Park, Australia

Buley Rockholes, Litchfield NP, NT, Australia

Jenolan Caves, Blue Mountains, NSW, Australia

The coast of Porticcio, Corsica

Cozy little cabin in the woods

Mt. Rainier: over Reflection Lake, under Ursa Major

Volcano Anak Krakatau

Gjógv, Eysuroy, Faroe

Cueva de los Verdes, Canary Islands

Old Man's Cave Ohio, US

Ice Caves of Kamchatka, Russia

Allgäu, Germany

Yellow Tulip Farm, Netherlands