A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

An allegorical statue of a giant pregnant woman representing justice and truth.

A secret greenspace hides atop a Capitol parking garage.

An overlooked tribute to one of the most important peace deals in American history.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

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

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

There's a crumbling old mansion inside the Smithsonian National Zoo.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This lovely pocket park is one of the most under appreciated in D.C.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

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

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

The U.S. Fish Commission’s effort to mass produce carp.

100 years later, they're still down there.

A much-maligned monument to teetotalism.

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