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

A monument to the military service of America's greatest traitor refuses to even name him.

A castle built for love, and abandoned due to heartbreak.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

More than 5,000 contemporary and "historic" mustards from around the world.

A mysteriously dark cemetery monument fuels stories and legends galore.

A bypass decorated with large wooden troll carvings.

This cave holds a surprisingly colorful variety of geological oddities.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

143 feet of leaping muskie whose mouth can be used as a wedding venue.

Paranormal activity on the great lakes.

The center of the only hemisphere that awards visitors with a commemorative coin.

A bedazzled house and crown "jewel" of outsider artist Loy Allen Bowlin.

Statue dedicated to the star of an old television show.

A place to eat for on-the-run agents and espionage enthusiasts.

The palatial McDonald's that inspired Wesley Willis.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

These pretty kitties killed and ate as many as 135 railway workers.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

Ever wanted to can Spam?

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.