The ruins of this long-abandoned unsuccessful gold mine can still be found.

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Literal "money laundering."

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

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

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

The only tennis court that falls under the jurisdiction of the central bank.

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

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

A memorial to a shareholder activist feared by CEOs around the United States.

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

This taxidermy horse was a Civil War hero.

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

Atop this media building, two hives containing more than 30,000 bees keep the surrounding area vibrant.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

This grisly headstone doesn’t seem to be resting in peace.

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

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

The 28,000-year-old specimen is remarkably intact.

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

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.