This spectacular track has run continuously since 1882.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

This rustic cabin, outfitted with gun slits, was once home to John D. Tewksbury, patriarch of the bloodiest family feud in American history.

A mysterious spirit totem at the edge of Navajo lands.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

L.A.'s oldest operating bowling alley is a beautifully restored homage to its speakeasy days.

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

Rare recess caves fill this unbelievably beautiful Ohio park.

A series of labyrinths in the Nevada desert inspire meditation and calmness.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

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

This collection of neon icons is preserving Arizona's history, one sign at a time.

A somber monument commemorates the site of a Native American reservation marked by suffering.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

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

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.