The famous artist couple lived and worked here, in two different houses separated by a bridge.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

The "Seinfeld" diner.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

A hands-on traveling collection of the innovative devices of yesteryear.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

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

A fascinating insight into daily life in the Eastern Bloc.

A collection of abandoned typographic signs from Berlin and beyond.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A surprising museum of 20th-century technology.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A Hungarian pharmacy museum with a box full of mummy powder.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

The only castle in North America to ever house European sovereigns.

At a museum of everyday objects, it is the act of collecting that is really on display.

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.

Amid the marketing blitz of modern Times Square is an elegant holdover from its showbiz glory days.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Tucked in the back of this amazing antique store is an important piece of medical history.