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

Community bookshelf of 25-foot-tall book spines.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

Curious cave that stays a cool 56 degrees all year long.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

European castle ruins in an American state park are actually the product of death and grief.

Erosion and time have created a naturally-formed water park.

This haunting sculpture was created as a statement on the mechanized warfare of the First World War.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

The headquarters of the prestigious World Food Prize celebrates the heroes in the fight against hunger, has no cafeteria.

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

An obelisk commemorating Lincoln's role in connecting the coasts.

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

An unlikely Transcendental Meditation haven in the American Heartland built around the ancient Vedic principles of balance and harmony.

The highest point in Iowa, while not that impressive to mountain states, has earned its own monuments.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

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

The “American Gothic" artist's largest works hang in an Iowa State University library.

While there are no actual snakes in the history of this crooked road, there may be a number of dead horses.

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.

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

Home with Gothic windows featured in a famous painting.

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