A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

A wondrous old library overlooking the nation's capital.

This forgotten boat elevator was an engineering marvel in its heyday.

Decades before the scandal, this staircase on the river was a literal "water gate."

The national park was once a plantation estate.

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

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

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

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

Giftshop catering to cryptozoologists and anyone with a sense of humor.

This poor little statue is the most vandalized memorial in Washington.

An Industrial Revolution-era public work that purified water using nothing but sand.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

The site of the climactic scene from the classic horror film is now a historic landmark.

There's a crumbling old mansion inside the Smithsonian National Zoo.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

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

This grand gothic brewery has been pumping out suds for over a hundred years.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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