The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

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

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

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

Before Nixon, "watergate" meant canals.

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

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

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

The most accurate timepiece in the world.

A historic arena where the Beatles played their first concert in the U.S.

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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The Conduit Road Schoolhouse is one of the last one-room schoolhouses remaining in Washington, D.C.

The span is crooked and made from two older recycled bridges.

Every drop of D.C. tap water flows through this old waterworks.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

A star fort along the C&O Canal in western Maryland that protected America in three wars.