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Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia

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

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

View from inside ice cave under the Vatnajokull Glacier with person for scale, near Jokulsarlon Lagoon, South Iceland, Polar Regions

The Sanctuary of Pla de Petracos, site of Neolithic rock paintings, near Castell de Castells, Marina Alta, Alicante province, Spain, Europe

Mer de Glace Glacier Ice Cave, Mont Blanc Massif, Chamonix, Haute-Savoie, French Alps, France, Europe

Mer de Glace Glacier Ice Cave, Mont Blanc Massif, Chamonix, Haute-Savoie, French Alps, France, Europe

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

Tourist exploring an ice cave on Breidamerkurjokull Glacier, Vatnajokull Ice Cap, Iceland, Polar Regions

Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia

Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia

Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia

A climber is lowered from a the edge of a huge cave in the Mascun Gorge, near Rodellar, Sierra de Guara mountains, northern Spain, Europe

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

View of tidewater glacier cave found deep inside Neko Harbor on the western side of the Antarctic Peninsula, Polar Regions

Main altar in the new Salt Cathedral of Zipaquira, Cundinamarca department, Savannah of Bogota, Colombia, South America

Entrance to the Santo Tomas cave complex in the Vinales National Park, UNESCO World Heritage Site, Pinar del Rio, Cuba, West Indies, Caribbean, Central America

The interior beauty of Jameos del Agua with a ray of light, Haria, Las Palmas, Lanzarote, Canary Islands, Spain, Atlantic, Europe

A cliff cave below Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Copper mines in the former French mining town of Santa Rosalia, Baja California Sur, Mexico, North America

Snorkellers at the entrance to Tomolo (Goa Keramat) cave, Tomolo, Misool, West Papua, Spice Islands, Indonesia, Southeast Asia, Asia

Tourist exploring the Ana Kakenga Cave, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, South America

Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia

View through cave entrance across the clear turquoise waters of Cala Corsara to the pink granite headland of Punta Rossa Corsara, Spargi Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

Looking down into the Los Peces fresh water cave near Playa Giron, Matanzas Province, Cuba, West Indies, Caribbean, Central America

Sea cave in the King Leopold sandstone formations, Hunter River, Frederick Harbor, Kimberley, Western Australia, Australia, Pacific

Museum in the Chauvet-Pont-d'Arc Cave, UNESCO World Heritage Site, Ardeche, Auvergne-Rhone-Alpes, France, Europe

Southern coast, sea and rock formations, Kleftiko, Milos Island, Cyclades Islands, Greek Islands, Greece, Europe

Microbats constitute the suborder Microchiroptera, found in a sandstone crevice on Bigge Island, Kimberley, Western Australia, Australia, Pacific

A shallow cave carved out of a cliff wall below the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

San rock art cave paintings on the wall of a rocky overhang in the Cederberg, Western Cape, South Africa, Africa

San rock art cave paintings on the wall of a rocky overhang in the Cederberg, Western Cape, South Africa, Africa

Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Hiker in a mountain cave in autumn season in Stelvio National Park in Brescia Province, Lombardy, Italy, Europe

Scuba diver explores underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

Scuba divers explore underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

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

Guests from the Lindblad Expedition ship National Geographic Sea Lion doing various things in and around the Baja Peninsula

Lindblad Expeditions Guests exploring a sea grotto by Zodiac in the Galapagos Island Archipeligo, Ecuador. No model or property release are available for this image.

Scuba diver explores underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. No model releases.

Guests from the Lindblad Expedition ship National Geographic Sea Lion doing various things in and around the Baja Peninsula

Lindblad Expeditions Guest taking photos inside sea grotto in the Galapagos Island Archipeligo, Ecuador. No model or property release are available for this image.

Scuba diver explores underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

Scuba divers explore underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

Lindblad Expeditions Guests exploring a sea grotto in the Galapagos Island Archipeligo, Ecuador. No model or property release are available for this image.