A former major munitions plant that has been converted into a sprawling art space.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Legends surround this jagged rock formation in the New Mexico desert.

The world's oldest bookshop still in operation.

Former villa and estate of James Deering developed to preserve native tropical forests.

An architect's childhood fantasy treehouse made real.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

The oldest continuously operating fish market in the United States.

Five candy-colored villages on the Italian Riviera.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A circus legend leaves an unexpected endowment.

This black shoreline is made up of exploded lava particles.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

Decades before the scandal, this staircase on the river was a literal "water gate."

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

The video game-themed street art first popped up in the French city.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

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.

The national park was once a plantation estate.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Perhaps the most scandalous statue of America's first president.

This demon atop the Notre-Dame de Paris looks utterly bored.

The prototype for all Nazi concentration camps.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.