The largest underground pedestrian tunnel system in the U.S. mostly caters to the people working in the offices above, but provides a great, air-conditioned way to traverse the city.

A cannon designed to fire an atomic warhead.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This Arkansas town is known for its gangster history, its healing waters, and now its brews.

Locally known as the "Onion” and the "Egg Beater,” Casper’s most recognizable buildings are beloved local landmarks to many, and eyesores to others.

The first declared National Monument in the United States.

A museum dedicated to the mysterious cryptid.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

This soaring sculpture and Sioux Falls landmark represents the leap of faith taken to make one's dreams come true.

Just a man taking his prehistoric pet for a stroll.

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