Oldest building in California still in use.

A world-class observatory in the California desert.

The American rainmaker and a burst dam.

A futuristic-looking beach house built for the owner of a snack food brand.

San Diego's most historic and haunted home.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

One of the largest trees of its kind in California.

North America's largest accredited model railroad museum.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

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

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

This spectacular track has run continuously since 1882.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A recreation of an Old West apothecary full of curios.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

A hotel with a rich Wild West history of miners and bootleggers.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

This abandoned building made of petrified wood was once a hotspot for buying moonshine.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This Arkansas town is known for its gangster history, its healing waters, and now its brews.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.