A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

The longest navigable underground river in the United States is home to countless blind and albino animals.

In rural Iowa, an imported 19th-century windmill overlooks an unlikely enclave of Danish culture.

Elaborate hand-carved wooden clocks two brothers made in their spare time are on display at this handsome little museum.

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

Most comprehensive museum in America devoted to one ethnic group.

This simple home was the beginning of a long journey for the iconic Western film star.

The Iowa state contender for largest pan in the world oddly only comes in second or so.

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

An eclectic assortment of medieval architecture in a small Iowa town.

The World's Largest Bull.

A single artist is behind these large-scale models made of hundreds of thousands of two-inch wooden matchsticks.

An old town theater converted into a celebration of the hobo legacy.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

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

A number of gruesome unsolved murders have turned this simple home into a morbid tourist trap.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.