A bit of retro transportation flair preserved in the world's largest department store.

A spiritual vortex among the red rocks in Sedona.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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

Quite simply the largest tree in the world (by volume).

The world's longest known cave system.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.