Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia

Longboats moored in creek amid rain forest, while tourists visit Clearwater Cave, Mulu National Park, Sarawak, island of Borneo, Malaysia

Kanarra Creek Canyon, Kanarraville, Utah, United States of America, North America

Big Bronco Western Store, Cave Creek, Arizona, United States of America, North America

Old truck and American flag, Cave Creek, Arizona, United States of America, North America

Tourists walking into Tunnel Creek National Park, Kimberley area, West Australia, Australia, Pacific

'Bacon strip' curtain formations at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Stalactites, stalagmites and rimstone at Marakoopa Cave in Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Stalactites at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

'Bacon strip' curtain formations at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Stalactites, stalagmites and columns at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Stalactites and columns at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Stalactites, stalagmites and columns at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Ice chapel with meltwater stream, ice field at the foot of the Watzmann east face, Berchtesgaden National Park, Watzmann, Schoenau am Koenigssee, Upper Bavaria, Bavaria, Germany, Europe

Ice cave and glacier snout of Schlatenkees, source of the creek Schlatenbach. parts of the have collapsed and melted away. Therefore an ice cave with two openings exists. The Schlatenkees is one of the biggest glaciers in Austria and retreating rapidly. Glacial till, moraine debris and roche moutonnee are visible, Europe, central europe, austria, East Tyrol

Ice cave and glacier snout of Schlatenkees, source of the creek Schlatenbach. parts of the have collapsed and melted away. Therefore an ice cave with two openings exists. The Schlatenkees is one of the biggest glaciers in Austria and retreating rapidly. Glacial till, moraine debris and roche moutonnee are visible, Europe, central europe, austria, East Tyrol

Native American cave art in Indian Creek, Utah.

Native American cave art in Indian Creek, Utah.

Female Javalina, or Collared Peccary (Pecari tajacu), with young foraging for acorns at Cave Creek Ranch in the Chiricahua Mountains near Portal; Arizona, United States of America

Striped Skunk (Mephitis mephitis) at Cave Creek Ranch in the Chiricahua Mountains near Portal; Arizona, United States of America

Family Crossing Bear Creek On Hiking Trail Leading To The Ice Cave At Bixby State Preserve, Near Edgewood, Iowa, United States Of America

Family Crossing Bear Creek On Hiking Trail Leading To The Ice Cave At Bixby State Preserve, Near Edgewood, Iowa, United States Of America

Abiqua Falls, Cascade Locks, Oregon, United States Of America