This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

A modernist landscape of water and sci-fi concrete.

This downtown Dallas art installation is always on the lookout.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

The Ozarks' strangest dwelling.

Claims to be the "World's Highest Hill."

A peculiar forest that was handcrafted for government experiments.

An acoustic anomaly with a mysterious cause.

An old spiral fire escape dangles above a public courtyard in Midtown Oklahoma City.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

A subterranean haunt where wine and homemade biscottis are always on the menu.

Giant granite rocks standing end-to-end like a train of circus elephants.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

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

This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

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

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

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

Nature's biggest mammal swims in landlocked Oklahoma.

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

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

This artsy public restroom is shaped like a giant john.

A unique attraction and museum dedicated to exploring iconic roadside structures.

This tiny old water tower once doubled as a makeshift jail.