This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Ship skeletons haunt Baltimore's waterways.

This memorial honors five journalists who were killed in a mass shooting in 2018, and affirms the importance of the first amendment.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Remnants of a storybook amusement park hidden behind a strip mall.

A remote horde of architectural treasures fit for Indiana Jones.

A priceless collection of the Nation's cryptologic history.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

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

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The United States Capitol's former columns still stand.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

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

The former home of Lillian Evans Tibbs and her grandson, Thurlow Evans Tibbs Jr., whose prodigious contributions to music and art spanned more than 90 years.

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.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.