During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A subterranean shelter remains intact under a busy Paris railway station.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

100-windowed castle turned art gallery, built by one dedicated mason.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

Historic medieval fortified city in southwest France.

This castle-fortress is a living example of the transition from medieval defenses to modern fortifications.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

A Spanish forest is filled with mysterious stone carvings.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

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

Most famous work of one of Frank Lloyd Wright's sons.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

An enchanted arts space which assumes infinite identities.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

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

Panorama exhibition hall in old silent theater with a beautiful backyard garden.

A castle that was built stone by stone by an eccentric journalist.

A ring of creosote bushes that are estimated to be 11,700 years old.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

Gift shop offering toe tags and chalk body beach towels tucked into a coroner's office.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.