The biggest solar telescope in the world helps reveal the secrets of our sun.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

This centuries-old pueblo church houses the body of a Franciscan friar who is said to be a rare "incorruptible" corpse.

On the side of a remote mountain, a stone face bearing an inscription of mysterious origin.

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

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

A Wild West jailhouse that slid down the mountainside.

An artificial crater field that trained astronauts for lunar exploration.

Tubing through a cave lit with glowworms is a magical underground experience.

Virgil's many-mouthed gateway to the underworld.

A stealthy Apache hideaway that became the haunting site of a mass grave.

A park in Mexico offers all the experiences of an illegal border crossing except for one: the border.

An enormous concrete structure built over a nuclear crater.