Novice Buddhist monk at entrance of cave, Pak Ou. Laos http://www.terragalleria.com/asia/laos/pak-ou/picture.laos4658.html Tourist praying at an urn with incense near the entrance of Phong Nha Cave. Vietnam http://www.terragalleria.com/vietnam/picture.viet7652.html Novice Buddhist monk at entrance of lower Pak Ou cave. Laos http://www.terragalleria.com/asia/laos/pak-ou/picture.laos4657.html Women sitting at entrance of cave, Elephanta Island. Mumbai, Maharashtra, India http://www.terragalleria.com/asia/india/mumbai/picture.indi39177.html Entrance shaft and rain-fed water drip. Mammoth Cave National Park, Kentucky, USA. http://www.terragalleria.com/parks/np-image.maca39884.html Tour boats near the entrance of Phong Nha Cave. Vietnam http://www.terragalleria.com/vietnam/picture.viet7651.html Cave with sculptures and entrances, Elephanta Island. Mumbai, Maharashtra, India http://www.terragalleria.com/asia/india/mumbai/picture.indi39182.html Entrance of Frozen Niagara section of the cave in winter. Mammoth Cave National Park, Kentucky, USA. http://www.terragalleria.com/parks/np-image.maca0480.html Outside of rock-cut cave, Elephanta Island. Mumbai, Maharashtra, India http://www.terragalleria.com/asia/india/mumbai/picture.indi39179.html Entrance shaft. Mammoth Cave National Park, Kentucky, USA. http://www.terragalleria.com/parks/np-image.maca39883.html Group praying at the altar at the entrance of Tan Thanh Cave. Lang Son, Northest Vietnam http://www.terragalleria.com/vietnam/picture.viet7686.html Urn and lianas near the entrance of upper cave, Phong Nha Cave. Vietnam http://www.terragalleria.com/vietnam/picture.viet7654.html Rock-caved cave, Elephanta Island. Mumbai, Maharashtra, India http://www.terragalleria.com/asia/india/mumbai/picture.indi39178.html Ranger pointing to cave entrance to tourists. Mammoth Cave National Park, Kentucky, USA. http://www.terragalleria.com/parks/np-image.maca39891.html Women praying at the altar at the entrance of Tan Thanh Cave. Lang Son, Northest Vietnam http://www.terragalleria.com/vietnam/picture.viet7685.html Entrance of Painted Cave, Santa Cruz Island. Channel Islands National Park, California, USA. http://www.terragalleria.com/parks/np-image.chis30176.html Interior and entrance of Phong Nha Cave with Rocks and boats. Vietnam http://www.terragalleria.com/vietnam/picture.viet7659.html Entrance to sea cave. Bandon, Oregon, USA http://www.terragalleria.com/america/oregon/bandon/picture.usor37725.html Woman horse-riding on beach next to sea cave entrance. Bandon, Oregon, USA http://www.terragalleria.com/america/oregon/bandon/picture.usor37739.html Steps and railing leading down to historical cave entrance. Mammoth Cave National Park, Kentucky, USA. http://www.terragalleria.com/parks/np-image.maca39885.html Urn and incense near the entrance of Phong Nha Cave. Vietnam http://www.terragalleria.com/vietnam/picture.viet7653.html Historic entrance of the cave. Mammoth Cave National Park, Kentucky, USA. http://www.terragalleria.com/parks/np-image.maca5401.html