At Colossal Cave Park, just east of Tucson, we visited the cave system and got to talking with this guy, who told us he knew everything about everything west of the Mississippi. We wished we had more time, but... DSC_0150 Technical Details Camera: NIKON D80 Taken: June 13, 2010 Focal length: 35mm Aperture: f/2 Exposure: 1/400 second ISO: 1600