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Volcanic cone with plume of smoke of Mount Mayon, 2462m, and grotto or wayside shrine, Bicol Province, Luzon Island, Philippines, Southeast Asia, Asia

The Grotto (Morning Hall) Pavilion, Tsarskoe Selo, Pushkin, UNESCO World Heritage Site, Russia, Europe

Tourists walking in the ice grotto inside Rhone Glacier, Gletsch, Canton of Valais, Switzerland, Europe

Giant Buddhas at the Yungang Grottoes, ancient Buddhist temple grottoes near the city of Datong, UNESCO World Heritage Site, Shanxi, China, Asia

Giant Buddhas at the Yungang Grottoes, ancient Buddhist temple grottoes near the city of Datong, UNESCO World Heritage Site, Shanxi, China. Asia

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

Old Fisherman's Grotto restaurant on Fisherman's Wharf, Monterey, California, United States of America, North America

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

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

A diver shines a light in on a cavern filled with glassy sweepers (Pempheris schomburgkii) at Molasses Reef in Key Largo, Florida.

A young married couple celebrate their ten year anniversary by scuba diving in the clear freshwaters of Devil's Den Springs, a sinkhole in Williston, Florida, as the afternoon sun filters down into the cavern.

A scuba diver surfacing and looking up into the light as he ascends from the bottom of Devil's Den, a sinkhole in Williston, Florda.

A technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.

A scuba diver ascends into the light emanating above through the sink hole into the clear freshwaters of Devil's Den cave near Williston, Florida.

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

Two scuba divers in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

View of the Massabielle grotto at the Sanctuary of Our Lady of Lourdes, a Catholic shrine and pilgrimage site in Lourdes, Hautes-Pyrenees, France

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 Adam and Eve, Boboli Garden, Florence (Firenze), UNESCO World Heritage Site, Tuscany, 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

Statue of the Madonna in a grotto at this volcanic tourist park with a peace tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, 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

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