Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Pompeii's less famous neighbor is still revealing her secrets.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A 16th-century horror show built in a lovely Italian garden.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The only freestanding table rock formation east of the Mississippi.

A humble homemade ride attracts visitors from around the globe to this small Midwestern town.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

St. Augustine's record-setting narrow street was designed to protect against pirates.

The final home of the legendary Danish sailor said to have lived to be 146 years old.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Giant disc-shaped gate took 20 men to close off this city in Madagascar.

This picturesque island graveyard is the final resting place of dozens of notorious pirates.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

The historic home still shows the scars from a little run-in with the British in 1813.

More than a century of radio history is told in these displays.

An abandoned castle owned and ignored by Masons carries a cursed history.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

Known for the tunnel that leads visitors to the water.

Two small chapels housed inside an ancient tree.

Living trees form the structure of an open-air palace.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.