400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Three gardens with toilets and urinals filled with bright flowers started as a protest against zoning rules.

A winding district gerrymandered into the shape of a mantis.

The first declared National Monument in the United States.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

Destructive children, start your engines.

Yo, Adrian!

A wall of chewing gum moonlights as collective art.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This giant temperature attraction created some giant electric bills.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

Belly up to the bar in Cowtown, don't forget to buy some boots.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

A fitting attraction for the corn capital of the world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

Wisconsin's most celebrated export gets the royal treatment on I-94.

This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

The only Bahá'í house of worship in North America and one of only a handful worldwide.