Tubing through a cave lit with glowworms is a magical underground experience.

Museum of Fijian history, including its former tradition of cannibalism.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

Ancient serpentine sacrifice holder that has stood the test of time.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

Mausoleum and Holy Seat of Antiochus I of Commagene.

The best-preserved ancient theater in the world.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

This famous city eluded concrete detection until the early 2000's.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

Roman ruins top white travertine terraces formed by ancient hot springs.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The only quarter of the Old City not dedicated to a major world religion.

A tall karst islet popularized by 007.

This elaborate temple was built around one of the Buddha's teeth.

The most playful of the life-sized statues that make up Singapore's "People of the River."

This house is one of the most colorful in the country, and is the last remaining example of a historic villa.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

A museum dedicated to the history of Tokyo's often-overlooked working-class district.

These sculptures were created by a 17th-century artist who had never seen an elephant.