Panoramic view of the town of Uchisar with its old houses and ancient cave dwellings in the volcanic tufa, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Volcanic tufa formations, known as fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

View across rooftops to cave houses in the troglodyte district, Guadix, Granada, Andalucia (Andalusia), Spain, Europe

Old troglodytic cave dwellings in Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Cave dwellings in Pigeon Valley, Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Cave dwelling among euphorbia, La Palma, Canary Islands, Spain, Atlantic Ocean, Europe

Purple heather on the cliffs above Smoo Cave near Durness which has one of the largest sea cave entrances in Britain, Durness, Highlands, Scotland, United Kingdom, Europe

Sassi di Matera, UNESCO World Heritage Site, Basilicata, Italy, Europe

View over the village of Rhumsiki from a cave, Mandara mountains, Far North province, Cameroon, Africa

Necropolis, Facade Street, Petra, UNESCO World Heritage Site, Jordan, Middle East

House in rock, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Troglodyte cave dwellings Guadix

Detail of the Ibrahim Mosque, Cave of Machpela, also called Tomb of the Forefathers or Cave of the Patriarchs in Hebron, West Bank, Palestine, Western Asia

Tomb, lycian burial place in the rocks facing the river delta at Caunos, Dalyan in the district of Mugla, Turkey

Temple of Pan with Pan's grotto, above in the center shrine of Nebi Khader, religious figure for Druze and Muslims, Banias National Park, Mount Hermon, Golan Heights, Israel, Middle East, Southwest Asia

Detail of the vault of the Cave of Machpela, also called Tomb of the Forefathers or Cave of the Patriarchs in Hebron, West Bank, Palestine, Western Asia

Hang Son Doong, located in Phong Nha Ke Bang National Park, Vietnam, is home to a high quantity of rare cave pearls.

Cave Homes In Rock Formations And Fairy Chimneys, Goreme, Cappadocia, Turkey

Cave Homes In Rock Formations And Fairy Chimneys, Goreme, Cappadocia, Turkey

Cave Homes In Rock Formations And Fairy Chimneys, Goreme, Cappadocia, Turkey

Cave Homes In Rock Formations And Fairy Chimneys, Goreme, Cappadocia, Turkey

View of Restaurant Bear Cave surrounded with snow in winter, South Tyrol, Italy