The park takes its name from the remnants of ancient trees which have been transformed into brilliantly colored minerals through a series of geological processes.
The park gets its name after the Saguaro cactus, which can live as long as 200 years, growing over fifty feet tall and weighing more than ten tons.
An enormous collection of weirdly-shaped rock pinnacles, remnants of a huge volcanic eruption about 25 million years ago, cover the higher regions of the park.
In a remote and wild area in Southern Arizona, you can visit the largest concentration of organ pipe cactus.
It preserves the prehistoric ruins of an ancient Hohokam community.
The National Monument actually comprises three canyons, with walls rising steeply for about a thousand feet.
