A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

This is one really big nut.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

In the middle of a desert subdivision, there is supposedly an impact crater site from Kcymaerxthaereal times.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

What is the Thing?

Limestone caves with spectacular showcase chambers.

The world's largest military aircraft cemetery.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

The Magical World of George Phar Legler.

A reproduction of earth's many biomes.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A $100,000 tumbleweed decorates an Arizona park and ride that got its priorities a bit tangled.

A self-built castle made by a mysterious man.

A mysterious "wedding cake" castle in the middle of the urban desert.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

America's most famous piece of self-built architecture.