A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

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

The United States Capitol's former columns still stand.

Art deco landmark on the outskirts of Washington, D.C.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

One street divides a single town that stands in two U.S. states.

This old-fashioned carhop restaurant gave the world the waffle cone.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A Civil War Museum with some notable medical antiques.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

Eighteen miniature death-scene dioramas.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

An abandoned stretch of highway, deteriorating next to the operational one.