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

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

World's second largest particle accelerator, where nature reveals its secrets.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

This is not your typical jungle gym.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

Limestone caves with spectacular showcase chambers.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

A reproduction of earth's many biomes.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Giant granite rocks standing end-to-end like a train of circus elephants.

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

Experience a charming 1930's version of "infotainment."

The highest point in Nevada had to be decided by court order after California tried to claim it as their own.

The first life claimed by this record-breaking peak wasn't lost to exposure or a fall but rather lightning.

A giant Troll lurks under one of Seattle's oldest bridges.