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

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

A stealthy Apache hideaway that became the haunting site of a mass grave.

This historic national park is covered in the stunning ruins of red rock pueblos.

A spiritual vortex among the red rocks in Sedona.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A house carved into a rock in the 1940s.

Dramatic river bend surrounds a natural red-rocked pedestal.

What is the Thing?

Ancient pueblos built into the base of a natural canyon wall.

Most-visited and most-photographed slot canyon in the American Southwest.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.

The first safe in this California town had to hold all the gold.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

This 19th century train workshop is a treasure trove of railroad history.

The first U.S. town to secede from the Union, only to vote themselves right back in.

Rising out of miles of farmland, these buttes are sometimes called the world's smallest mountain range.

These unusual houses look like giant boats that washed ashore on a residential street.

A local dialect born in the late 19th century is only spoken in this isolated California valley.

A water tower shaped like a giant coffee pot looms over a small Swedish village in Central California.

An off-grid art installation that encourages its visitors to imagine a world without waste.