A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

This likeness of the famous revolutionary is entirely made of recycled scraps of metal.

No one is quite sure of the origins of these idyllic natural hot springs at an abandoned mountain resort.

This mesmerizing architectural wonder will take your breath away with its unusual color patterns.

The fight to make Bengali an official language started in this stunning university hall.

This seemingly random 30-foot statue of an oryx in Qatar's capital was a mascot for the 2006 Asian Games.

Ancient structures used to make and preserve ice in the deserts of Persia.

Tracking the 1,500-year history of Korea's star cabbage.

This doorless 20th-century elevator doesn't stop or slow down.

A cheeky architectural easter egg.

Europe's second largest ossuary wasn't discovered until 2001.

A surreal statue honoring Prague's favorite literary son.

Walk through Czech history in Prague's largest graveyard.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

Naturally formed rock city in Poland.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.