The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

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

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

The oldest university museum west of the Mississippi retains its 19th century feel.

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

This large midwestern cavern features impressive rock formations and an underground waterfall.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

Former hotel turned into haunted playground.