Thank you Mike, even if I think it could be in The Maze district of Canyonlands,,,I'll be in the USA next august and I'll try to find these incredible rocks in the Needles or wherever, who knows, maybe I'll be lucky...go to the Paria Wilderness Ranger Station and ask there for some informations: if there's a ranger called Rachel, tell her that it was me (Marco, from Italy) to give you her name, she knows me very well and she could show you exactly where are these formations...ciao and have fun...