The site of the climactic scene from the classic horror film is now a historic landmark.

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

This unique historical monument features large concrete spheres designed to resemble fallen stars.

A weathered, American Foursquare-style house originally built for lumber merchant William Wimsatt.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

This unassuming passageway played a key role in one of the most important events in U.S. history.

These abandoned waterworks are crumbling into the Potomac River.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Before Nixon, "watergate" meant canals.

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

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

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

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

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

A nuclear reactor created for Eisenhower's "Atoms for Peace" campaign is now used for research at a Dutch university.

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

The hidden offices underneath Memorial Bridge have been locked up since 1976.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

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

The oldest continuously operating fish market in the United States.

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