An ever-evolving wall of graffiti art off East Liberty Street.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

The national park was once a plantation estate.

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

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

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Washington's iconic carousel has a nice piece of Civil Rights history.

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A nostalgic bibliographic gem.

The walls of the iconic dome are hollow and have a secret stairway.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A museum dedicated to exhibiting remarkable outsider art.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

An eerie, decaying ghost town destined to fade into the forest.