The pilot of the tailwheel-equipped airplane was attempting to land at an airstrip within a canyon. The pilot overflew the runway twice; he first observed a right crosswind followed by a “limp” windsock during his second pass. The pilot then maneuvered through the canyon to land, encountering turbulence as he approached the runway. During the landing rollout, the airplane drifted to the left side of the runway despite the pilot’s rudder input. The right main landing gear hit a depression in the ground, the airplane then ground looped, and its left wingtip impacted terrain. The airplane sustained substantial damage to its left wing. After the pilot exited the airplane, he noted there to be a “strong, direct tailwind” present. The pilot reported there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.