Art deco landmark on the outskirts of Washington, D.C.

A much-maligned monument to teetotalism.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The house where John Wilkes Booth conspired with his co-conspirators.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

What looks like a normal building is really a hollow facade hiding a subway vent.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

The mysterious canine hides atop a drain pipe on the back of the building, some say as a sneaky shoutout to Yale.

This recreation of a 19th-century dime museum is full of oddities.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

Dedicated to preserving the history of free Black communities in Brooklyn and beyond.

Risk arrest while partying to fund art.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

This lovely hilltop tower was specifically built to withstand 100 MPH winds.

This graceful little figure is a one-of-a-kind version of the cherished character.

Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.