Al Gerow, 81, a retired geologist and tour guide at Longhorn Cavern near Burnet, leads a group down 52 steps to the cavern entrance. It's the first of three tours he'll lead (11 a.m., 1 and 3 p.m.) through the cavern on Mondays and Thursdays. He turns 82 on Sept. 16. Photo: Terry Scott Bertling, San Antonio Express-News