One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

This precariously perched fortress was once ruled by a crow-worshipping baron.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

Twelve natural mummies are displayed in the crypt of this former monastery school.

A church dedicated to the Mexican skeleton saint.

66,000 pieces of art, donated by one of the world's richest men.