A popular tourist cave with a dark past.

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

San Diego's most historic and haunted home.

Where the writer penned his famous story about a jumping frog.

A Biblically-based Natural History Museum.

Acres of natural wonders left behind by a socialite-turned-gardener.

This stunning sea creature-shaped home blends into the landscape like a fantasy villa.

360-degree virtual reality chamber physically immerses scientists into their data.

Colorful Native American paintings are hidden within this small cavern.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

A hotel and restaurant serving as the mecca of kitsch.

An alley covered with 20 years of bubble gum.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

An optical illusion found amid a logged redwood forest.

There's nothing creepier than a cemetery next to a clown motel.

The Zalud family experienced a number of tragedies in one decade, giving rise to rumors that the 19th century house is haunted.

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

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

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

The unbelievably opulent home built for an infamous newspaperman.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

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