This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

The oldest structure in a beachside California city was built to serve eight students.

Things roll uphill on this Mexican street that seems to defy gravity.

The ruins of the bathhouse used by the ill-fated last Aztec emperor still lie in Chapultepec Park.

From working out of his garage to the James Beard semifinals, one Tucson baker has kept his fan base—and his grains—local.

The remains of an Aztec school and various intriguing artifacts lie below a modern cultural center.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

Swim or sail to this pie-slinging boat off the coast of St. Thomas.

This landmark is a central figure in the Nez Perce origin story.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

The only surviving prototype of Buckminster Fuller's revolutionary car.

One of the American Southwest's most extensive collections of Navajo rock art.