The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

America's only nuclear missile silo open to the public.

This historic national park is covered in the stunning ruins of red rock pueblos.

A Saint Nicholas-themed ghost town in the Mojave desert.

A self-built castle made by a mysterious man.

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

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

Most-visited and most-photographed slot canyon in the American Southwest.

The pharmacy's retro ice cream mixer is one of the last of its kind.

This sky-high radio mast is formerly the tallest man-made structure in the world.

The world's tallest turtle riding the world's largest snowmobile.

Part of a secret 1970s nuclear defense program is now open to the public.

This museum is a full-size replica of an original church constructed during the 13th-century.

Annual convention held by the largest pyrotechnic community in the world.

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

One North Dakota man's vast collection of rare rocks, polished orbs, and geological wonders.

"...I guess that was your accomplice in the wood chipper?"

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

A monument to the center of the North American continent may be off by a few miles.

The remnants of an early American attempt at missile defense.

A technicolor place of worship for Elevationists.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The longest hedge maze in the world.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.