Ride a boat through this magnificent underground world, which now doubles as a theater.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

This Alamo Square mansion is rumored to have hosted satanic rituals and other occult practices.

Inside this museum, the history of the Walt Disney Family empire is on full display.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

“Live hard, ride fast, eat pizza” at this joint filled with Evel Knievel memorabilia.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

World-famous, Pink's still manages to keep its prized cult fetish status.

This 19th-century performer's gravestone identifies her as "the smallest woman ever in this Kingdom."

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

The silent film master's legacy commemorated in all the right and wrong places.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

France's most famous cemetery, with some of its most curious tombs.

This massive library holds what was once the largest book collection in the world.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The morbid items in this small and hidden museum are not for the weak stomached.