A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

This little-known relic crypt holds stolen parts of a Roman Empress.

A mechanized clock where a man fights off a dragon, crab, and rooster.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

The largest underground church in Europe.

Science fiction's grandfather has a fittingly marvelous tomb.

A haunting collection of the vanished and disappearing natural world.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

The encased skull that is widely believed to belong to St. John the Baptist.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.