Nevada's largest cactus collection stands outside a candy mogul's small factory.

This quiet park's strange sedimentary spires were named after Kodak's color film.

The fifth-longest natural arch in the world, and the longest outside China.

Just a man taking his prehistoric pet for a stroll.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Yo, Adrian!

10,000 flowered plants bloom in the City of Roses.

Home to Hollywood history and a very special salt crystal.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

Despite its name, this route in southern Utah offers a heavenly day trip.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A motel dedicated to Southwestern nostalgia.

The highest point in Washington state is a volcano covered in glaciers.

This super steep hike ascends 2,000 feet in less than a mile.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This replica of the Greek structure is in the heart of Nashville.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This spectacular track has run continuously since 1882.

This massive redwood tree has a hole in the base big enough to drive through.

Legends surround this jagged rock formation in the New Mexico desert.