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

An eerie, decaying ghost town destined to fade into the forest.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

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

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

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

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

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

A secret greenspace hides atop a Capitol parking garage.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

Also known as the Founding Church of Scientology.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

A public art jibe at one of the United States’ oldest and longest-serving senators.

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

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

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

A much-maligned monument to teetotalism.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

Perhaps the most scandalous statue of America's first president.

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

Obscure Freemasons still live in D.C.’s largest private residence.

The oldest continuously operating fish market in the United States.