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

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

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

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

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

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

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

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

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

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

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

D.C. once had its own tiny rival to the New York Stock Exchange.

Once home to the largest photo service in the United States.

This nine-story building is the oldest standing skyscraper in D.C.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

A public art jibe at one of the United States’ oldest and longest-serving senators.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

The historic home of an educator, abolitionist, activist, and poet.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

For over 70 years, this house was home to a pioneering Black artist and educator.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.