1376-17 - Reflections from Cathedral Cavern, Little Langdale Valley, English Lake District, Cumbria, UK

1376-16 - Reflections from Cathedral Cavern, Little Langdale Valley, English Lake District, Cumbria, UK

1116-52832 - Woman standing under the large, boulders on the seaside shores of The Baths, a famous beach in the BVI's, Virgin Gorda, British Virgin Islands, Caribbean

1112-8681 - Entrance to 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

1112-8680 - Stalactites 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

1112-8678 - Stalactites 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

1112-8679 - Floe stone 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

1112-8677 - Entrance to 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

1112-8676 - Floe stone 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

1112-8675 - Entrance to 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

1112-8674 - Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

1112-8673 - Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, 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

1112-8670 - Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

1112-8671 - Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

1112-8669 - Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

1112-8668 - Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

1112-8667 - Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

1353-362 - John Lennon Statue outside the Cavern Pub, Matthew Street, Liverpool, Merseyside, England, United Kingdom, Europe

1353-336 - Detail of the John Lennon Statue outside the Cavern Pub, Matthew Street, Liverpool, Merseyside, England, United Kingdom, Europe

1353-303 - John Lennon Statue outside the Cavern Pub, Matthew Street, Liverpool, Merseyside, England, United Kingdom, Europe

1350-6630 - Swimming at Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

1350-6633 - Gran Cenote de Tulum in Yucatan Peninsula, Quintana Roo, Mexico. There are thousands of cenotes dotted all over Mexico���s Yucatan Peninsula, and their existence is as much a defining characteristic of the region as is the distinct geological feature from which they result. Once revered by the ancient Mayans as sacred wells, they are now magnets for tourists, adventurers, and explorers alike.

1350-6628 - Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

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

749-821 - The Cavern Wall of Fame in Matthew Street, Liverpool, Merseyside, England, United Kingdom, Europe

1116-49670 - Wire coral goby (Bryaninops yongei) on wire coral (Cirrhipathes sp.), a relative of black coral.

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

1113-105117 - Bat colony in front of the cave entrance, near Padangbay, Bali, Indonesia

1113-103306 - View at giant trees at Yosemite National Park, California, North America, America

1113-104024 - Cave with stalagtites and buddha figures, Tham Khao Luang, Thailand, Asia

1113-103174 - Man climbing in a cave, Immenstadt, Bavaria, Germany

1113-103028 - Stalactite cave, Cuevas del Drach, Porto Christo, Majorca, Spain

1113-103727 - Two women inside a glacier cave, Brunegg Glacier, Canton of Valais, Switzerland, MR

1174-9723 - Person exploring a glacial Ice Cave on the Svinafellsjokull glacier

1174-9725 - Glacial Ice Cave, Svinafellsjokull glacier, Skaftafell National Park, Iceland

1174-9724 - Glacial Ice Cave, Svinafellsjokull glacier, Skaftafell National Park, Iceland

1112-5712 - The naturally formed Redwall Cavern, Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

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

746-89531 - Beautiful view of Matera cityscape in summer season, Italy.

1116-47079 - Sunset Light Shines Through The Water Of Seljandefoss Along The South Coast, Iceland

1116-46354 - A Double Waterfall Drops Into Green Water In A Dark Canyon, Kananaskis Country, Alberta, Canada

1116-46138 - Prometheus Cave, Imereti, Georgia

1218-1111 - Carlsbad Caverns, The Big Room, UNESCO World Heritage Site, Carlsbad, New Mexico, United States of America, North America

1218-1112 - Carlsbad Caverns, The Big Room, UNESCO World Heritage Site, Carlsbad, New Mexico, United States of America, North America

1218-1113 - Woman in Desert Loop Trail in Carlsbad Caverns National Park, New Mexico, United States of America, North America

1172-3446 - Zhangjiajie, Hunan Province, China

1172-3445 - Zhangjiajie, Hunan Province, China

1172-3444 - Zhangjiajie, Hunan Province, China

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

1116-41399 - This green sea turtle (Chelonia mydas), an endangered species, is passing under Lone Tree Arch, a dive site on the Kona Coast, Kona, Island of Hawaii, Hawaii, United States of America

1116-40001 - Diver along a drop off covered with gorgonian and alcyonarian coral, Fiji

1116-39781 - Diver at the entrance to First Cathedral off the island of Lanai, Hawaii, United States of America

1116-39784 - Diver at one of the many openings around the dive site called First Cathedral off the island of Lanai, Hawaii, United States of America

1116-40000 - Divers are framed by the twin openings at a dive site known as Skull Cave off the Kona coast of the Big Island, Hawaii, United States of America

1116-39956 - Pacific ocean surge brings down oxygenated sea water to a school of Whitebar Surgeonfish (Acanthurus leucopareius), Hawaii, United States of America

1116-39925 - Aerial view of the southern end of the reef surrounding the island of Yap, with a dive boat anchored at Yap Caverns, a famous site for scuba divers, Ngariy, Yap, Micronesia

1116-39759 - Diver at the entrance to a cavern off the island of Gato, Bohol Sea, Philippines

1116-39758 - Diver and schooling Yellowfin Goatfish (Mulloidichthys vanicolensis). This species turns red at night and when they are in caves during the day, Kauai, Hawaii, United States of America

1116-39783 - Diver outside of the dive site called First Cathedral off the island of Lanai, Hawaii, United States of America

1116-39782 - Diver inside a cavern known as First Cathedral off the island of Lanai, Hawaii, United States of America

1116-40004 - A diver (MR) shines her light into a crevice opening off Kaiwe Point on the Kona coast, Island of Hawaii, Hawaii, United States of America

1116-39993 - Diver and a school of Dusky batfish (Platax pinnatus) at the entrance to a cavern with alcyonarian coral off the island of Gato, Bohol Sea, Philippines

1292-482 - The Aillwee Cave, The Burren, County Clare, Munster, Republic of Ireland, Europe

1292-483 - The Aillwee Cave, Burren, County Clare, Munster, Republic of Ireland, Europe

1184-2517 - Algar do Carvao Natural Reserve cave, Island of Terceira, Azores, Portugal, Atlantic, Europe

1184-2518 - Algar do Carvao Natural Reserve cave, Island of Terceira, Azores, Portugal, Atlantic, Europe

1179-3027 - Tourists inside Aillwee Cave, The Burren, County Clare, Munster, Republic of Ireland, Europe

1179-3029 - Tourists inside Aillwee Cave, The Burren, County Clare, Munster, Republic of Ireland, Europe

1176-867 - Cavers in Hang Roc (Ruc Mon) cave in Phong Nha, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

1176-863 - The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

1176-860 - Hikers in the interior of Galaxy cave on the Ben Dang River in Thien Ha, Ninh Binh, Vietnam, Indochina, Southeast Asia, Asia

1176-864 - The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

746-79385 - rhone glacier: ice cave, furka pass, switzerland

746-50780 - Under the glacier, Saas-Fee, Vallese, Switzerland, Europe

1172-2474 - Dwarf Mongoose

1184-886 - Cave system, Minami Daito, Daito Islands, Japan, Asia

1178-24636 - View of cave, Carlsbad Caverns National Park, New Mexico

1175-368 - Interior of Schlossberg Caves in Homburg, Saarland, Germany

1175-369 - Tourist at castle mountain caves, Homburg, Saarland, Germany

792-749 - Entrance to the Cavern Club, birthplace of the Beatles, Mathew Street, Liverpool, Merseyside, England, United Kingdom, Europe

816-6266 - Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

816-6269 - Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

816-6267 - Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

816-6268 - Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, 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

832-269225 - 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

832-111159 - Tourists in the Redwall Cavern, Grand Canyon, Arizona, USA, America

832-74466 - Cave, Carlsbad Caverns National Park, New Mexico, USA

832-74469 - Calcite flowstone formation in the Big Room, Carlsbad Caverns National Park, New Mexico, USA

832-74463 - Chandelier, stalactite formation, Carlsbad Caverns National Park, New Mexico, USA

832-74474 - Chandelier, stalactite formation, Carlsbad Caverns National Park, New Mexico, USA

1113-61121 - Dripstone caves of Dirou, Peloponnese, Greece

1113-60179 - People on the beach in Cathedral Cave at Coromandel Peninsula, North Island, New Zealand, Oceania