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

The blinking light atop the iconic landmark has been sending secret messages for decades.

Walking by this fence is like strolling along a portal to various fictional worlds.

From a neon Rapunzel to a bike traffic meter to a street fair color scheme, the most opened drawbridge in the US is a veritable art gallery.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The world’s largest magazine collection was born from a single shelf in a teen’s bedroom.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

The final resting place of a space program monolith.

A tribute to the movie stars who fought to keep Beverly Hills separate from Los Angeles.

A second generation sun-powered marvel lights up the night.

In 2013, historians discovered a hidden room devoted to the art of making royals' hot chocolate.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

A Bibliophile's Dream.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Ancient snack bar of the Roman Empire re-opened.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.