A crumbling hospital from the 1850s on Roosevelt Island.

The only Leonardo Da Vinci painting in the Western Hemisphere.

An unconventional and naturalistic sculpture depicting the artist marking his territory on an exterior faculty wall.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

The resting place of a Civil War celebrity's amputated limb.

A lighthouse on this West Virginia lake started as a joke, then the forces of nature helped make it a reality.

In the mountains of West Virginia is this perfectly preserved Art Deco train station.

A monument to an Irish secret society thought to be responsible for a string of violent attacks in Pennsylvania coal mines.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

The remains of one of the last mining camps developed on the New River.

An abandoned coal mine reached by a steep hike.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

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

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

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

The tallest waterfall in West Virginia.

This tiny man looms large over downtown Charleston.

This steam locomotive served as both an interesting static display and unique playground equipment since 1959.

A ghost town that was wiped out by a flood in 1940.

The oldest arched-covered bridge in Virginia has truly withstood the test of time.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

A retired tobacco farmer's pet project turned into a sturdy miniature city.

This airfield is home to a number of retired vintage planes in various states of disrepair.