The largest self-built castle in the U.S., six decades in the making.

The world's longest known cave system.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

Pink, packed sanctuary and home of the world's fullest-time Elvis fanatic.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

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

A table rock formation that has been intriguing West Virginians for years.

This tiny museum kept in a B&B laundry room holds the death mask of notorious bank robber Pretty Boy Floyd.

The failure of one component toppled this entire bridge during rush hour.

Featuring one of the most complete and original collections of Presidential memorabilia, this is the site of the last front porch presidential campaigns.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

The highest point in Virginia can only be reached by passing through ponies and flowers.

Exact replica of the ancient monument, but much, much lighter.

Veritable museum of 20th century country music history.

A whimsical folk art garden full of punny pieces and a diorama containing 3,500 toys.

Moonbows over Kentucky.

The world's largest fully steerable radio telescope.

Home of a 28-foot tall stalagmite known as the War Club.

This former fire tower is now a rustic observatory that offers amazing views of eagles, hawks, and the Appalachian Mountains.