San Francisco Bay's ghost town.

Harlequin costumes, signed scripts, and armor-wearing puppets.

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

One of the most important yet well-hidden museums dedicated to the history of medicine.

Gods clash with machines in a power plant regenerated as a museum.

The mystic whose incorrupt corpse still attracts the faithful.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The underground sanctuary of a mysterious ancient cult.

This glamorous old building is said to have inspired the Tower of Terror.

World's largest collection of serial killer artwork and other macabre exhibits.

Former hotel turned into haunted playground.

A "simple-hearted artist" turned an isolated Icelandic valley into his own art museum.

This replica Viking village was created for a film that was never shot and is now open to visitors.

Staves, storm-calling, and of course, necropants.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

A deserted hodgepodge of experimental structures designed by nearby university students.

Featuring the last fully walkable parapet walkway in Europe.

From Japan to Italy, this California park explores the world's cultures through their gardens.

A Mysterious Masonic tomb in San Luis Obispo.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

A strange house built only at night, with rumored mystic inspiration.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

Machinery left over from California's once thriving mercury industry now attracts artists and explorers.