A haunting collection of the vanished and disappearing natural world.

A secret greenspace hides atop a Capitol parking garage.

A failed piece of Orientalism has become the proud symbol of a community.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

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

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

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

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

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

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

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

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

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

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

These abandoned waterworks are crumbling into the Potomac River.

When it comes to handsignals (and colonialism) rock always beats scissors.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.