After his presidency, George Washington planned to live only a few blocks from the Capitol building.

A line of blue paint marks the route of the inaugural parade.

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

A surprising, but overlooked example of geology in the middle of the nation’s capital.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

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

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

Also known as the Founding Church of Scientology.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

The district's only illusionarium supports free writing programs for local students with every purchase.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

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

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

A portal into the bricked up canal that runs through the heart of Washington D.C.

These abandoned waterworks are crumbling into the Potomac River.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.