Ruins of a Carnegie family mansion on Cumberland Island.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A delightful but little-known public observatory and planetarium in Munich.

These jeweled relics have a scandalous and contested past.

These 17th-century mummies are no longer naturally preserved, but remain on display today.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

In 1830, cemetery workers in Cham unearthed a chamber housing thousands of skeletal remains from the 13th century, which can still be viewed today.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

This historic stone bridge has an entire neighborhood clinging to its sides.

Terrifying derelict military hospital once housed a recuperating Hitler.

"The most colorful grottoes of the world.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

An intricate and amazing house built by architect Karl Junker.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

A wunderkammer of mysterious objects and stories.

A small but immensely extravagant palace built by the "Night King."

A striking 12th-century-style castle built on the edge of a cliff.