This university transit system is a 1970's vision of the future.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The United States Capitol's former columns still stand.

These five Art Deco homes were meant to solve the "small house problem."

A lawn full of retired spacecraft on display at one of NASA's first research labs.

Home to items never before seen by the public.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

What began as an art installation is now the private drinkhaüs for a brewery's employees.

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

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

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

This is not your typical jungle gym.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

A floating museum that was sunk by a flood and left to rot in the tides.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

The site of the one and only battle of Lord Dunmore's War.

The world's largest fully steerable radio telescope.