Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This is one really big nut.

The world's longest known cave system.

A jewel of early electric boosterism once again charms Connecticut's historic "Hat City."

Where the Millerites gathered to watch the end of the world in 1844—and left disappointed.

A bronze ballot box stands at the spot where Susan B. Anthony voted illegally.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A relic of roadside lore and perhaps the first of its kind in North America.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

This unusually circular centenarian barn became a Route 66 icon.

A building so large that it has its own weather.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

So many migrating birds roost on the bridge, it has a special summer speed limit.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

A fitting attraction for the corn capital of the world.

More than a century old, this trading post resides in the Navajo Nation.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

This 47-foot chile pepper sculpture welcomes Scoville heat unit obsessed tourists to the Big Chile Inn.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.