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

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

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An overlooked memorial honoring the local Washington residents who died in World War I.

There’s a hidden military meme engraved on the World War II Memorial.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

This pun was simply waiting to come to life, and one defense contractor made it so.

The watery grave of an impractical idea.

The intense competition of the 19th-century fur trading industry played out at this fort in Western Canada.

This replica of an 8th century burial ship actually sailed to Norway before returning home to Minnesota.

The U.S.' first commercial park dedicated entirely to flying drones.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

This 19th-century religious artwork was once highly controversial—because it was donated to the church by a divorcee.