An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Don't blink or you'll miss it.

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

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The world's largest military aircraft cemetery.

An urban laboratory.

Limestone caves with spectacular showcase chambers.

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

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

A reproduction of earth's many biomes.

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