A tropical paradise once home to space exploration and military installations.

The world's smallest drawbridge.

A mass grave for victims of one of the city’s worst fires.

A curious friendship between two inanimate ladies.

The Habsburgs' royal collections of art and wonders.

An astounding collection of medical specimens, including bits of President Lincoln.

Three stories above you, your salad is being grown.

Three prestigious academic collections come together to create a world-class natural history museum.

A little sculpture with a large wardrobe.

A world of whimsy and wonder aboard a one of a kind historic landmark vessel.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

A Manhattan Episcopal church with an eerie underground crypt.

The Vatican of the movie industry turned into an actual church.

Peek through the gates at this oasis from the city, full of Old English charm.

Cold war icon and onetime "hole" in the iron curtain.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Hundreds of antique bank vault locks on display in New York City.

The oldest surviving synagogue in New York City is now a soaring art space.

Salute the leader of the proletariat.

This little museum is built on a theater that was once a wildly elaborate speakeasy.