Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Scattered throughout London are ancient remnants of the city's former bounding wall.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

An underground city of salt.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

The fairy tale castle of the "fairy-tale king."

A huge wooden clock that is so beautiful its creator was forcibly blinded.

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.

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

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.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

Ruins of a German Castle on top of a towering stone pillar.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

This small group of sand dunes manages to pack in a strange rainbow of colors.

The "Prussian Versailles" that is as glorious today as when it was built.

The city-sized home palace of one of ancient Egypt's most powerful rulers gives us a rare look into the lives of the epoch's rulers.

This roundabout was renamed in honor of the Swedish king's royal fender-bender.

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

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