The Leaning Tower is just like it sounds. A big leaning tower. In the center of it is a prominent crack system that starts out fairly thin and widens as it goes up. The crack was first climbed to about halfway up (on aid) by Chris Foster and George Rinker in 1978. They left a bundle of pitons and anchor material when they bailed off. Cam Burns (with help from Mike Schillaci and Paul Fehlau) then climbed the entire crack in late 1989 (A2). It was later free-climbed by Luke Laeser who I think renamed it Mean Leaner.
A mixture of gear from thin stuff to wide cams. [If aiding, a shitload of gear from 000C3 to #4 Camelot, and camhooks]