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

Right next to departures—how convenient!

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

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

The romance of early commercial flight still fills this Art Deco destination.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

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

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

A former major munitions plant that has been converted into a sprawling art space.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

The maritime museum that boasts the largest nautical library in the western hemisphere.

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.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

America's first federal monument.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

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

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

This unique historical monument features large concrete spheres designed to resemble fallen stars.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

The record holder for the world’s largest peach.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

One of corporate America's best-kept secrets is also one of the most publicly displayed.