A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

This remote desert watering hole has a connection to a curious chapter of American history.

The remnants of a creative early method of wildfire prevention.

The eroded core of an ancient volcano is now accessible by a short hike.

An artificial crater field that trained astronauts for lunar exploration.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

The largest and most well-preserved petroglyph site in the Verde Valley.

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

A self-built castle made by a mysterious man.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

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

A peaceful, unique botanical garden complete with waterfalls, mini islands, and swans.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

An 18th-century Spanish watchtower made entirely of seashell and concrete.