A priceless collection of the Nation's cryptologic history.

A hidden alley in urban Baltimore is a haven for graffiti artists.

An eerie, decaying ghost town destined to fade into the forest.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

A small museum in the Bay of Pigs gives the Cuban perspective on the famously failed U.S. invasion.

Cuba's historical trains remind natives of their country's sugary sweet past.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

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

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

A hospital where antique dolls are given new life.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A miniature city within a city, complete with traffic signs, signals, and streets to teach Baltimore's youth traffic safety laws.