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Statue of John Lennon near the original Cavern Club, Matthew Street, Liverpool, Merseyside, England, United Kingdom, Europe

Statue of John Lennon close to the original Cavern Club, Matthew Street, Liverpool, Merseyside, England, United Kingdom, Europe

Waterfall from Slate Cavern Tunnel entrance, Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

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

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

Whitetip reef sharks (Triaenodon obesus) resting on the ocean floor, Hawaii, United States of America, Pacific, North America

Sacred Cenote, Mayan ruins, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

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

Reflections from Cathedral Cavern, Little Langdale Valley, Lake District, Cumbria, England, United Kingdom, Europe

Reflections from Cathedral Cavern, Little Langdale Valley, Lake District, Cumbria, England, United Kingdom, Europe

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

The Tham Ting spiritual caverns from the Pak Ou caves site, on the Mekong river, with many Buddha sculptures, north of Luang Prabang, Laos, Indochina, Southeast Asia, Asia

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

One of the Stations of the Cross, Salt Cathedral of Zipaquira, Cundinamarca department, Savannah of Bogota, Colombia, South America

Former Mine Working Slate Cavern Tunnel at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

Waterfall from Slate Cavern Tunnel entrance, Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

Waterfall from Slate Cavern Tunnel entrance, Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

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

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

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

Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

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

The Redwall Cavern, a giant cave in the walls of the Grand Canyon, seen while rafting down the Colorado River, Grand Canyon, Arizona, United States of America, North America

Matthew Street, site of the original Cavern Club where the Beatles first played, Liverpool, Merseyside, England, United Kingdom, Europe

Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

The Redwall Cavern, a giant cave in the walls of the Grand Canyon, seen while rafting down the Colorado River, Grand Canyon, Arizona, United States of America, North America

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

John Lennon statue and Cavern Pub sign, Mathew Street, Liverpool, Merseyside, England, United Kingdom, Europe

View of Botha's Hall in the Cango Caves near Oudtshoorn in South Africa's Western Cape Province. To the left of centre is the Double Petrified column, in the centre is the Leaning Tower of Pisa and behind that is the Petrified Weeping Willow. On the right are the Frozen Victoria Falls.

View of the walls and ceiling of Van Zyl's Hall in the Cango Caves near Oudtshoorn in South Africa's Western Cape Province.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Some Aboriginal designs on a cavern wall in the Arnhem territories, Northern Territories, Australia, Pacific

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

red Ridged Clinging Crab (Mithrax forceps) nice profile of crab's head and claws in a small dark cavern, Cayman Brac, Cayman Islands, Caribbean

A man exploring the old abandoned Coniston copper mines in the Lake District, Cumbria, England, United Kingdom, Europe

Chalk carving of face in hand-dug tunnel, Hell-Fire Caves, West Wycombe, Buckinghamshire, England, United Kingdom, Europe

Tarpon (Megalops atlanticus), swimming nearby coral caverns with diver behind, Cayman Islands, Caribbean

Southern stingray (Dasyatis americana) lying in the sandy bottom of a cavern, Ressurreta, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil, South America

Chalk carving of face in hand-dug tunnel, Hell-Fire Caves, West Wycombe, Buckinghamshire, England, United Kingdom, Europe

Southern stingray (Dasyatis americana) lying in the sandy bottom of a cavern, Ressurreta, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil, South America

Glass fish in cave (Parapriacanthus guentheri), large school of fish in cavern mouth, looking out to clear blue sea in background, Red Sea.

Tarpon (Megalops atlanticus), swimming nearby coral caverns with diver behind, Cayman Islands, Caribbean

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.

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.

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.