America's first public mental health facility.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

A castle built by an eccentric medieval enthusiast in rural Ohio.

This historic furnace was once used to produce cannonballs during the Civil War.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

The site of the Scopes Trial contains a small exhibit dedicated to the famous case.

Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The crash of this great airship signaled the beginning of the end for dirigibles.

The center preserves and houses artifacts ranging from the colonial era to modern times from across Appalachia.

On the side of a Virginia highway, a collection of monuments commemorates an 18th-century trek through the Blue Ridge Mountains.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

Two gems of Beaux Arts architecture that have been sitting vacant for years.

This structure among the trees was the result of divine inspiration.

A full-scale replica of a 1774 colonial settlement in Kentucky.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

Home to several unusual artifacts, including a huge painting of George Washington.

One of the few places where you can explore a 1918 paddlewheel steamboat from stem to stern.

This abandoned train tunnel has been the subject of countless ghost stories for years.