This Old West prison built into the side of a cliff was said to be inescapable.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Inside this garden, visitors are offered a glimpse into how inhabitants of the region survived centuries ago.

This golf ball–shaped former desert real estate office now houses a UFO museum.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

Ancient human, animal, and geometric figures drawn in the earth.

A scrap-metal sculpture recalls an infamous 19th-century camel.

This memorial pyramid marker honors one of the United States Government's first official camel riders.

The celebrated eyesore created by starry-eyed sweethearts.

It's where the final scene of the beloved Tom Hanks movie was filmed.

Dad jokes and wordplay abound in this comic fake cemetery.

This little slice of old Jerusalem in Oklahoma is the evolution of a 90 year old passion play.

A peculiar forest that was handcrafted for government experiments.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

Over 50 historic windmills whir away at this outdoor museum.

An acoustic anomaly with a mysterious cause.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

A detached cement mixer has been transformed to resemble a relic from some obscure NASA mission to Oklahoma.

To honor his gardening wife, this yard artist turns bowling balls into playful, colorful sculptures.

A statue in the Texas town that proudly calls itself the killer bee capital of the world.

The tree is thought to be the oldest oak in Texas and was once crowned state champion for its monumental size.

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.