Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

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

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Right next to departures—how convenient!

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

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

The system of air guns are fired off remotely to scare any trespassing avians.

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

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

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

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

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

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

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

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

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

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.

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