The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

A small square plaque marks a failed assassination attempt that could have changed history.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.

Medical and zoological curiosities for sale.

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

The so-called "Bridge of Thighs" in Palm Springs allows nudists to discreetly cross the road.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

The famous animator's private station house and man-cave was the birthplace of imagineering.

Wild West history in Hollywood style.

Hiding amid the largest camellia collection in the country lies a charming children's maze, donated by a secret admirer.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

A massive volcanic plug is now a protected area that hosts a number of bird species.

A house built from trash known as the poor man's Hearst Castle.

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

World War II-era Nazi compound nestled in the Santa Monica hills.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Pyramid home to an obscure religious group that practices modern mummification.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This chimerical bridge/tunnel appears to dead end right into the sea.

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

The highest bridge in America was built for an almost unnervingly small amount of money.