The narrowest house in America is seven feet of pure spite.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

Outsider art meets paleontology at this roadside reptile repository.

This grisly headstone doesn’t seem to be resting in peace.

A portal into the bricked up canal that runs through the heart of Washington D.C.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The first memorial dedicated solely to the Black troops who fought for the Union.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

"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!”

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

The school tested mustard gas for the U.S. Army during World War I.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

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

A building shaped like the Army Corps of Engineers logo, because why not?

The towering figures were created from the cemetery's fallen old-growth trees.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The span is crooked and made from two older recycled bridges.

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

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

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

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

A painfully obvious spy house sits right across the street from the Russian Embassy.