Beth and I visited there today. Dang, nothing but cactus, and if you've seen one, you've seen 'em all as far as I'm concerned.
I kept looking round for a Mall, where I could buy pretty pretty clothes, but no, just more cactus. A Saguaro - facinating!
An Organ Pipe, with a cristate growth. They don't know what causes it. Both Saguaro's and Organ Pipe can have them, they are pretty rare though
To give you an idea of the size, here's Beth taking its photo.
A Chain Fruit Cholla. Are your eyes glazing over yet?
Mine are. Hot dang! An arch. Woopy-doo.