Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

Recorded as the first person buried in Arlington Cemetery.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

The oldest continuously operating fish market in the United States.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A touching tribute to the "Queen of Soul."

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

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

A much-maligned monument to teetotalism.

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

A rusted blade sticks out from the trunk of this tree, left as a memorial to a young man who left to fight in the Civil War but never returned home.

What remains of the simple red brick chapel where the women's rights movement began.

A near tragic event on this bridge helped inspire the classic film "It's a Wonderful Life."

This statue commemorates the meeting of the most influential minds of the women’s rights movement.

Tour the original street level of Port Angeles, buried underground in 1914.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.