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

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Experience the life of an 1800's lumberjack at this interactive museum that is only accessible by railroad.

Tirelessly maintained by a Wisconsin man named JFK.

A circus of light and sound forms a sensory ode to an iconic train that will never pass through town again.

Every winter, the wind carves blocks of frozen water into beautiful abstract shapes inside this unusually curved tunnel.

An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

Five acres of divinely inspired folk art.

This cave holds a surprisingly colorful variety of geological oddities.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

An off-the-beaten path cave with an underground lake.

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

The highest point in Maryland is only accessible by hiking through another state.

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

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

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

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

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