An excursion train traverses a picturesque red-rock canyon along the Verde River.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A spiritual vortex among the red rocks in Sedona.

This former luxury resort in Kaua'i is now an abandoned relic.

This blowhole is supposedly caused by a trapped monster.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Oldest unrestored plantation house in America that is open to the public.

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

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

The "Father of Arizona" tried to build a Zoroastrian fire temple on the hill where he's now buried.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

See four top-secret US spy aircraft of the Cold War era, including the legendary SR-71 Blackbird and the A-12 Oxcart.

The disdain for this dysfunctional dam is reflected in a giant pair of scissors painted on the concrete face.