After not being used for a long time, Basilica Cistern was reopened as a tourist attraction in 1987
The Ice Caves in Grants, New Mexico
The Dambulla Cave temple is famous for hundreds of gilded Buddhist statues with a length of about 50 feet in full position like standing, sitting, lying. The statue is located just below 21,000 square feet of tapestry-like cave paintings which depicts Shakyamuni Buddha and his life. The statues of the deities Ganesh and Vishnu are also adorned daily by fresh wreaths of pilgrims who come there to worshi
Carved from a cliff 22 centuries ago by Buddhist monks, this five-chambered Dambulla Cave Temple in Sigiriya, Sri Lanka has been used as a monastery
For over 30 years, a top secret underground bunker built under the five-star Greenbrier hotel was used as shelter and preventive work of the House of Representatives and the Senate during the Cold War. Bunkers include two football-field-size areas with 1,100 beds, buffet counters, clinics and TV room.
In 1992, The Greenbrier Bunker in White Sulphur Springs, West Virginia was discovered and appeared on the cover of The Washington Post magazine, and three years later, the bunker was opened to the public
Wieliczka Salt Mine in Wieliczka, Poland exploited during the 13th century attracted tourists due to 300 burning candles cast shadows on a life-size rock-salt sculpture of Pope John Paul II
Mammoth Cave in Cave City, Kentucky is the world's longest cave. In the middle of 1800s, a doctor believed that the humid conditions here could help to cure tuberculosis so that he turned the cave into a sanitari
Cu Chi Tunnels once inhabited by the Viet Cong is more than 200 km. In 1988, the Vietnamese government turned a section of the tunnels into a tourist attraction with over 1 million visitors both local and foreign annually
Located outside Ho Chi Minh City Cu Chi Tunnels were dug during the war against France and became a secret base of the living room, infirmary, kitchen and office of the soldiers and people of Cu Chi