This century-old roadside attraction is full of bizarre rock formations.

The legend of a local monster still haunts this small town.

The only diamond mine in the world where you can keep what you find.

A river with some unusual, and occasionally dangerous, habits.

The clothes-washing king doubles as a community center with some unusual features, including an aviary filled with finches.

A plaque marks a former safe house on the secret route, now hidden next to a McDonald's.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

The final resting place of up to 6,000 Confederate soldiers, the largest mass grave in the Western Hemisphere.

The final resting place of the world's first nuclear reactor.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

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.

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

No one knows the origin of this small town’s unique name.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

Eight feet in diameter and more than 24 feet around.

The World's Largest Bull.

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

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

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

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

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

This zombie-themed restaurant stands out in the heart of corn country.