Witness some of the world’s coolest underground wonders. Reed Flute Cave in China is an 800-foot cave with an impressive collection of stalactites and stalagmites. Magma Chamber of Thrihnukagigur Volcano in Iceland is interesting because the magma mysteriously drained away, leaving crazy mineral colorations. Turda Salt Mines in Romania is now a subterranean museum and recreation center.
Puerto Princessa Underground River in the Philippines is a 5-mile long underground river that lies beneath a mountain. The Mausoleum of the first Kin Emperor in China is where the Terracotta Army lies, buried under a 30 story tall funeral mound. Dambulla Cave Temple in Sri Lanka is a sacred place that offers 22 centuries of history to visitors.
Tomb of Seti I in Egypt is comprised of several chambers covered with well-preserved paintings. Derinkuyu Underground City in Turkey was built to shelter as many as 20,000 people with a maze of tunnels miles long. Les Catacombes de Paris have 200 miles of the resting ground for the remains of 6 million Parisians. Basilica Cistern in Istanbul is an enchanting walk through a forest of 336 mismatched columns.