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Rock cut reclining statue of the Buddha preparing to enter nirvana, in cave 26, a chaitya in the Buddhist cave site at Ajanta, carved from a gorge in the Waghore River, Ajanta, Maharashtra State, India.

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

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

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

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

Thule semi-subterranean winter home sites in Fechem Bay, Baffin Island, Nunavut, Canada, North America

Drivers eye view of Circle line train entering tube station, London, England, United Kingdom, Europe

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

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

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

Typical stone alleys in the old town center of Matera also known as the Subterranean City, Matera, Basilicata, Italy, Europe

Water turning to steam by subterranean heat, Islote de Hilario, Timanfaya National Park, Lanzarote, Canary Islands, Spain

Furong stalactite cave of the Wulong Karst geological park, UNESCO World Heritage Site in Wulong county, Chongqing, China, Asia

Big Cave, Cueva del Milodon Natural Monument, Puerto Natales, Ultima Esperanza Province, Patagonia, Chile, South America

Sign for the S-Bahn and U-Bahn (suburban and underground public transport railways), Munich, Bavaria (Bayern), Germany, Europe

Basilica Cistern, Sultanahmet, UNESCO World Heritage Site, Fatih District, Istanbul Province, Turkey, Europe

Subterranean tunnel, Baths of Caracalla, UNESCO World Heritage Site, Rome, Latium (Lazio), Italy, Europe

Stone carvings in one of the subterranean corridors in Shitthaung temple with some original colour visible, Mrauk U, Rakhine, Myanmar (Burma), Asia

Mine in Cerro Rico, richest hill on earth, hand mining of silver and zinc today, Potosi, Bolivia, South America

Tourists in paddle boat at entrance to Riverine Cave. longest navigable river traversed tunnel in the world, Subterranean River National Park, Sabang Town, Palawan, Philippines, Southeast Asia, Asia

Water reflecting columns at Basilica Cistern (Sunken Palace) subterranean water system underground, Istanbul, Turkey, Europe

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

Subterranean Naples, part of an ancient Greek underground water cistern system, now open to tourists, Campania, Italy, Europe

The Giant, entrance to Chambers of Wonder,from Aluminium Casting by Bruno Gironcoli, Swarovski Kristallwelten, Crystal World museum, Innsbruck, Austria

Interior design, Subway Station Britomart, central Auckland, architects Mario Madayag and Jasmax, Auckland, North Island, New Zealand

Rocks and grottoes of the Atlantic coast. Volcanic island of Madeira. Fantastically beautiful coast. The concept of exotic and ecological tourism

Venetsa Cave in Bulgaria. Beautiful colorful and illuminated cave full with semiprecious onyx stones. Flowstones, stalactites and stalagmites lighted in different vivid colours

Pool of Reflections, stalactites reflected in a pool of water, stalactite cave, Ingleborough Cave, Clapham, Yorkshire Dales, England, Great Britain

Young multi ethnic couple walking together with luggage at a train station platform, enjoying their vacation

Construction work for Porta Alpina, the underground train stop in the Gotthard base tunnel, with driving work truck and a red train of the Matterhorn-Gotthard-Bahn (background), Sedrun, Grisons, Switzerland

Ice cave in Vatnajoekull glacier, glacier cave, Vatnajoekull National Park, South Iceland, Iceland, Europe

Ice cave in Vatnajoekull glacier, glacier cave, Vatnajoekull National Park, South Iceland, Iceland, Europe

Venetsa Cave in Bulgaria. Beautiful colorful and illuminated cave full with semiprecious onyx stones. Flowstones, stalactites and stalagmites lighted in different vivid colours

Monastery church of Panagia Agrilia, abandoned cave dwellings in erosion valley, panoramic view, island of Thirassia, archipelago of Santorini, Cyclades, Greece

Scenic Cenote Casa Tortuga near Tulum and Playa Del Carmen, a popular tourist attraction for local and international tourism

Princess cave at Phra Nang beach near Krabi, fertility, fertility temple, penis, dildo, penis grotto, phallus, phallus symbol, symbol, religion, pilgrimage site, faith, superstition, place, pilgrimage, Buddhism, Buddhist, cave, statues, sculpture, replica, Eros, symbolic, tradition, traditional, pilgrimage, travel, tourism, culture, figure, Krabi, Thailand, Asia