1382-3053 - Pak Ou low cave, Vat Tham Ting, overlooking the Mekopng River, Luang Prabang district, Laos

1382-3052 - Pak Ou low cave, Vat Tham Ting, overlooking the Mekopng River, Luang Prabang district, Laos

1292-6390 - Statue of St. Michael the Archangel, Sanctuary of St. Michael the Archangel, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy

1346-542 - Cave of Elafonisos island with orange rock color painted in white, Greece

1346-534 - Cave of Elafonisos island with orange rock color painted in white, Greece

1292-5545 - Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy

1235-2586 - Underground Grotto in Leeds Castle near Maidstone, Kent, England, United Kingdom, Europe

1218-2029 - Rocky cliffs of Shpella e Pirateve tourist attraction, Albania, Europe

860-292500 - Tek (Trimix) speleologist diver in a karstic underwater cave over 70 meters deep, Photogrammetry, twiglight zone, Mayotte

1184-12360 - Castellana caves (Castellana Grotte), Apulia, Italy, Europe

1184-12357 - Castellana caves (Castellana Grotte), Apulia, Italy, Europe

1384-244 - Environmental information poster about ecosystem of limestone cenotes, Yucatan, Mexico, North America

1112-8672 - Popcorn in the main cave at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

832-401577 - Stalagmites, stalactites, limestone deposits, Lipa Cave, Lipska pecina, Cetinje, Montenegro, Europe

832-401576 - Stalagmites, stalactites, limestone deposits, Lipa Cave, Lipska pecina, Cetinje, Montenegro, Europe

1350-5011 - Carved Buddha statue, Fengxian Temple, Longmen Grottoes and Caves, Luoyang, Henan Province, China, Tang Dynasty

1350-5009 - Niches in wall near Greek Theatre, Neapolis Archaeological Park, Syracuse, Sicily, Italy

846-212 - Entrance of the Orecchio di Dionisio cavern, Neapolis, Siracusa, Sicily, Italy, Europe

846-213 - Interior of the Orecchio di Dionisio cavern, Neapolis, Siracusa, Sicily, Italy, Europe

989-421 - Flooded limestone cave interior with many stalactites and stalagmites and reflections, Drach caves (Cuevas del Drach), Mallorca, Balearic Islands, Spain, Mediterranean, Europe

989-420 - Ornate columns formed by many hanging stalactites and rising stalagmites coalescing, Drach caves (Cuevas del Drach), Mallorca, Balearic Islands, Spain, Mediterranean, Europe

989-422 - Limestone cave interior with many stalactites and stalagmites, Drach caves (Cuevas del Drach), Porto Cristo, Mallorca, Balearic Islands, Spain, Mediterranean, Europe

29-5608 - Cave Dale, limestone valley behind Castleton, Peak District National Park, Derbyshire, England, United Kingdom, Europe

1116-48601 - Causeway to Sung Sot Cave, Ha Long Bay, Quang Ninh, Vietnam

1116-48617 - Sung Sot Cave, Ha Long Bay, Quang Ninh, Vietnam

1167-2315 - Devil's Bridge, limestone rock formation and arch, tourist takes selfie, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

1116-45828 - Qumran Caves, Qumran, Israel

1116-44398 - Bell Caves At Bet Guvrin, Maresha National Park, Israel

1116-44456 - Bell Caves At Beit Guvrin, Israel

1116-44455 - Bell Caves At Beit Guvrin, Israel

860-287535 - Concretions in the caves of Choranche, cave remarkably rich in fistuleuses, fine stalagmites that can reach several meters long, Massif du Vercors, Isere, France

860-287536 - Concretions in the caves of Choranche, cave remarkably rich in fistuleuses, fine stalagmites that can reach several meters long, Massif du Vercors, Isere, France

860-287428 - Cave of Harpea, anticlinal formed in limestone, Basque Country, Pyrenees, France

857-95926 - Gold Buddha statues line the sides of the famous Pindaya Caves in Shan State, Myanmar. The cave is a common tourist destination and pilgrimage site for Buddhists.

1116-41577 - A Filipino Tour Guide Holds A Lantern Inside Sumaging Cave Or Big Cave Near Sagada, Luzon Philippines

1116-41579 - A Filipino Tour Guide Holds A Lantern Inside Sumaging Cave Or Big Cave Near Sagada, Luzon, Philippines

1116-41578 - A Filipino Tour Guide Holds A Lantern Inside Sumaging Cave Or Big Cave Near Sagada, Luzon, Philippines

832-380072 - The Blue Grotto, natural sea arch and cliffs, Wied iz-Zurrieq, Malta, Europe

1240-221 - Marble Arch Caves, County Fermanagh, Ulster, Northern Ireland, United Kingdom, Europe

1240-210 - Marble Arch Caves, County Fermanagh, Ulster, Northern Ireland, United Kingdom, Europe

1218-488 - Cavers shining lamps on bats in Pokhara Bat Caves, Pokhara, Nepal, Asia

767-1197 - Karst Cave at Xinwen Stone Sea Global Geo Park, Sichuan Province, China, Asia

767-1195 - Karst Cave at Xinwen Stone Sea Global Geo Park, Sichuan Province, China, Asia

83-12823 - Caleta Negra (Black Bay) a popular boat trip and walk with its distinctive sedimentary and lava strata, Ajuy, Fuerteventura, Spain, Atlantic, Europe

733-6941 - Limestone stalactites and stalagmites in Ballic Cave, near Tokat, Central Anatolia, Turkey, Asia Minor, Eurasia

733-6940 - Limestone stalactites and stalagmites in Ballic Cave, near Tokat, Central Anatolia, Turkey, Asia Minor, Eurasia

1113-100605 - River flowing through the 7km long Tham Kong Lo limestone cave in Central Laos, Khammuan province, Southeast Asia, Asia

83-12822 - Unconformity of older Jurassic sediments and Pliocene limestone plus later lava on top at Caleta Negra, Ajuy, Fuerteventura, Spain, Atlantic, Europe

832-370220 - St Michael's Cave, Gibraltar, British overseas territory, Europe

832-375994 - Colourfully, illuminated Hang Sung Sot cave, Surprise Cave, Cave of Awe, a UNESCO World Heritage Site, stalactite cave in Halong Bay, Vietnam, Southeast Asia, Asia

816-7145 - Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

816-7150 - Tourists in a rowing boat entering the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

816-7147 - Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

816-7146 - Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

832-352167 - Batu Caves, limestone caves near Kuala Lumpur, Malaysia, Southeast Asia

832-337620 - Limestone Caves at Florida Caverns State Park, Marianna, Panhandle, Florida, USA

832-337624 - The "Christmas Tree Room" of Florida Caverns State Park, Marianna, Panhandle, Florida, USA

832-337621 - The "Wedding Room" of Florida Caverns State Park, Marianna, Panhandle, Florida, USA

832-276292 - Rochemenier Departement Maine Loire France cave dwelling dug in shelly limestone now museum wine cellar winery gave the main income of the inhabitants of the caves

832-269225 - Meramec Caverns with limestone structures such as stalagmites and stalactites on the Meramec River, Missouri, USA

832-269229 - Meramec Caverns with brightly illuminated limestone structures in the so called Movie Theatre, Missouri, USA

832-225173 - Egyptian temple of Debod, 2nd century BC, at dusk, Madrid, Spain, Europe

832-179212 - Interior of Ali Sadr Cave, Hamadan, Hamedan, Persia, Iran, Asia

832-179211 - Interior of Ali Sadr Cave, Hamadan, Hamedan, Persia, Iran, Asia

832-179210 - Interior of Ali Sadr Cave, Hamadan, Hamedan, Persia, Iran, Asia

832-179213 - Interior of Ali Sadr Cave, Hamadan, Hamedan, Persia, Iran, Asia

832-179567 - Interior of Ali Sadr Cave, Hamadan, Hamedan, Persia, Iran, Asia

832-153370 - Saalfelder Feengrotten or Saalfeld Fairy Grottoes, Saalfeld, Thuringia, Germany, Europe

832-142856 - Hang Sung Sot, Cave of Surprises, stalactite cave in Halong Bay, Vietnam, Southeast Asia

832-142866 - Hang Dau Go, Hidden Timber Cave, Halong Bay, Vietnam, Southeast Asia

832-142868 - Hang Dau Go, Hidden Timber Cave, Halong Bay, Vietnam, Southeast Asia

832-142860 - Hang Sung Sot, Cave of Surprises, stalactite cave in Halong Bay, Vietnam, Southeast Asia

832-142867 - Hang Dau Go, Hidden Timber Cave, Halong Bay, Vietnam, Southeast Asia

832-142864 - Hang Dau Go, Hidden Timber Cave, Halong Bay, Vietnam, Southeast Asia

832-133958 - Limestone caves on the beach of Matala, Crete, Greece, Europe

832-118299 - Tham Jang, Tham Chang caves in Vang Vieng, Laos, Southeast Asia

832-101704 - Jama Baredine, stalactite cave, Nova Vas, Porec, Istria, Croatia, Europe

832-106604 - Baumann's Cave, Ruebeland, Saxony-Anhalt, Germany, Europe

832-45626 - Chang Cave, stalactite or limestone cave in karst rock formations, Vang Vieng, Vientiane, Laos, Indochina, Asia

832-45136 - Cheese transporter passing narrow tunnel to the Monsted, Monsted limestone caves near Viborg, Jutland, Denmark, Europe

1113-87871 - Canoe entering a cave with limestone rocks at Phang Nga, Thailand

1113-27172 - Diver in Chandelier Dripstone Cave, Micronesia, Palau

1113-27173 - Diver at Entrance of Chandelier Dripstone Cave, Micronesia, Palau

857-58607 - The Underworld - Photographs from caves all over the world

857-58604 - The Underworld - Photographs from caves all over the world

857-58673 - The Underworld - Photographs from caves all over the world

857-58611 - The Underworld - Photographs from caves all over the world

857-58603 - The Underworld - Photographs from caves all over the world

857-58669 - The Underworld - Photographs from caves all over the world

857-58584 - The Underworld - Photographs from caves all over the world

857-58646 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58655 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58675 - The Underworld - Photographs from caves all over the world

857-58657 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58624 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58626 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58636 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58628 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58635 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58634 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France