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Divers preparing for dive in the grotto collapsed cave on Saipan, Northern Marianas, Central Pacific, Pacific

Cliff palace ruins dating from 1200-1300 AD shaded in limestone overhang, Mesa Verde, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America (U.S.A.), North America

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Ancient native pictographs on a canyon wall, Grotto Canyon, Alberta, Canadian Rockies, Canada, North America

Natural stone arch and open grotto framed by turquoise sea, Otranto, Lecce province, Salento, Apulia, Italy, Europe

Boats of tourists visiting the dramatic natural arch at the Blue Grotto, Malta, Mediterranean, Europe

Ancient native pictographs (cave paintings) on a canyon wall with a young woman walking in background, Grotto Canyon, Alberta, Canada, North America

Manarola at dusk view from a grotto, Cinque Terre, UNESCO World Heritage Site, La Spezia province, Liguria, Italy, Europe

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

Grotto of Heracles, Mount Kynthos, Delos Archaeological Site, UNESCO World Heritage Site, Delos Island, Cyclades, Greek Islands, Greece, Europe

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

Aerial view of the open grotto known as Grotta Sfondata on cliffs along the coastline, Otranto, Lecce, Salento, Apulia, Italy, Europe

The Yungang Grottoes, ancient Buddhist temple grottoes, UNESCO World Heritage Site, Shanxi, China, Asia

Grotto of Heracles, Mount Kynthos, Delos Archaeological Site, UNESCO World Heritage Site, Delos Island, Cyclades, Greek Islands, Greece, Europe

Grotto of Heracles, Mount Kynthos, Delos Archaeological Site, UNESCO World Heritage Site, Delos Island, Cyclades, Greek Islands, Greece, Europe

Grotto of Heracles, Mount Kynthos, Delos Archaeological Site, UNESCO World Heritage Site, Delos Island, Cyclades, Greek Islands, Greece, Europe

Grotto of Heracles, Mount Kynthos, Delos Archaeological Site, UNESCO World Heritage Site, Delos Island, Cyclades, Greek Islands, Greece, Europe

A snorkeler explores the fresh water grotto formations at Makatea, Tuamotus, French Polynesia, South Pacific, Pacific

A snorkeler explores the fresh water grotto formations at Makatea, Tuamotus, French Polynesia, South Pacific, Pacific

A snorkeler explores the fresh water grotto formations at Makatea, Tuamotus, French Polynesia, South Pacific, Pacific

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.

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

Replica of the grotto at the Lady of the Lourdes shrine in the Convent of the Concepcionistas. Viveiro, Lugo, Galicia, Spain, Europe

Buddhist caves of Dazu, World Heritage Site, a buddhist monk started in the 11th century to do this carvings in the rock, Mahayana buddhism, tourists, Dazu, Chongqing, People's Republic of China

Buddhist caves of Dazu with rock carvings, World Heritage Site, a buddhist monk started to do carvings in the rocks in the 11th century, Mahayana buddhism, Dazu, Chongqing, People's Republic of China

Tourists at the illuminated cave Grotta su Marmuri in the Gennargentu mountains, Sardinia, Italy, Europe

Information posted at Pan's grotto, Temple of Pan in the Banias National Park, Golan Heights, Israel, Middle East, Southwest Asia

Entrance to Huyen Khong cave, protective deities, guardian figures, Marble Mountains, Ngu Hanh Son, Thuy Son, Da Nang, Vietnam, Asia

Tourboat at Neptune Grotto, Grotta di Nettuno, Parco Naturale Regionale di Porto Conto, near Alghero, Sardinia, Italy, Europe

Black lava beach, basalt cave with basalt rocks, Reynisdrangar near Vík í Mýrdal, Suðurland, Southern Region, Iceland, Europe

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

Panorama shot of the largest submontane lake in Europe, Lac souterrain de St-Leonard, St-Leonhard Underground Lake, Valais, Switzerland, Europe

Light falling in the cave Grotte di Castellana, Castellana Grotte, Bari province, Apulia, Italy, Europe

652 steps leading down to the stalactite cave Grotta di Nettuno, Neptune's Grotto, Sardinia, Italy, Europe

Grotto Dedicated To Our Lady Of Reconciliation In The Valley Of The Glencree River, Wicklow County, Ireland

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

A mature man walking across a beach carrying his shoes in his hand, Grotto Beach, Western Cape, South Africa