The last king of Poland was interred in this church nearly 200 years after his death.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

This fairytale medieval church in Poland originally spent centuries in Norway.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

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

An underground city of salt.

A perfectly preserved hill village where the buildings are painted like white lace.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

Hungarian self-built castle.

The massive white mound and accompanying water terraces are a striking geological oddity.

Macabre astrological automaton clock dating to the late 1400s.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.