This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

A Turkish monastery tucked into a cliff wall.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A whimsical bridge adorned with decorative dragons.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

A giant portrait of an ancient king looms over the river.

This ancient Hindu temple is covered in thousands of colorful statues and has a long mythological history.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

Budapest's Communist-era statues, banished to the suburbs.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Warsaw's fantastically preserved gasworks...almost.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

This house's itty bitty size means no humans allowed.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

This unattributed sculpture in Amsterdam is hiding in plain sight.

The attic of a four-century-old canal house hides a clandestine church.