The rocks in this arid basin leave trails of movement behind them.

The ghostly remains of an accidental sea.

An enormous, inside-out glass globe built in 1935.

The world’s first penitentiary, meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A spiritual vortex among the red rocks in Sedona.

A reproduction of earth's many biomes.

An urban laboratory.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

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

These free-roaming horses were once destined to disappear from the land.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Historic funicular railway, believed to be the shortest railroad in the world.

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

With its peeling paint and faded sign, this theater-turned-recycling plant is a nostalgic relic of 1950s Americana.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

An alley covered with 20 years of bubble gum.