This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

These abandoned waterworks are crumbling into the Potomac River.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

There’s a hidden military meme engraved on the World War II Memorial.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A historic ruin just 20 feet away from a busy highway onramp.

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

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

The United States Capitol's former columns still stand.