These petroglyphs created by ancient Arizonians have withstood centuries of exposure to the elements.

Every year, festive decorations appear on this juniper tree located in the median strip of a busy highway.

Orcas on display and in the water.

A wall of chewing gum moonlights as collective art.

This spectacular track has run continuously since 1882.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A spiritual vortex among the red rocks in Sedona.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A geological mystery on Camelback Mountain.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

Native Americans built this circle of stones, which was used to predict astronomical events.