The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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.

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

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

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

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.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

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

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

The rogue roots are gradually consuming some of the historic marble grave markers.

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The "lovely red Vega" of the legendary record-settling pilot.

A nostalgic bibliographic gem.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A super-sized promotional trick that is now a D.C. landmark.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.