A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

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

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

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

This four-story steel sphere in Maryland was used to test biological weapons.

Time travel with sweets across history at this research-based candy store.

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

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

Bizarre Cavern.

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

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

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

One of the only memorials dedicated to journalists who died in combat.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

There’s a hidden military meme engraved on the World War II Memorial.

Perhaps the most scandalous statue of America's first president.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.