In 1932, Americans honored their first president's 200th birthday by planting trees.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

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

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

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

The only place for a truly presidential dram.

It was once the base for a series of domestic terror attacks.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

A secret greenspace hides atop a Capitol parking garage.

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

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

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

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

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The walls of the iconic dome are hollow and have a secret stairway.

Allegedly haunted by Walt Disney himself, this inconspicuous lamp is always kept lit in his honor.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

Storybook cottage in Beverly Hills was once the site of 1920s silent film studio, affectionately known as "The Witch's House."

The hidden jewel of Disneyland: a members only playground for the Disney elite.