The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

This bridge is haunted by the ghost of a distraught mother.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

The only place for a truly presidential dram.

Standing for over 200 years, the abandoned home of a Revolutionary War hero and later a succession of prison superintendents.

Hear, smell, see, taste, and touch history at this immersive Civil War hospital.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

A historic coal mine that doubles as a museum and tourist attraction.

This museum sits on the site of a decommissioned military communications base.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

One of the last active volcanoes on the Eastern seaboard.

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.