Mysterious stone tower featured in many alternative histories of the New World.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

The remnants of an early American attempt at missile defense.

Burial site more than 300 years old.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

The shattered remnants of a meteor that struck Santa Fe more than a billion years ago.

One of the most remote spots in America and the first protected wilderness area in Nevada, named after an old legend.

Singing sand that stands as the final remains of an ancient lake.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

The longest living non-clonal organisms on Earth.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

Walk the same tracks that once ferried Gilded Age aristocrats to their vacation destinations.

A miscalculation turns a very shallow freshwater lake into a very deep saltwater lake.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

Massive prehistoric mammals used these stones as oversized scratching posts.

An extensive collection of ancient Egyptian artifacts and mummies.