The pilot reported that he was practicing off-airport takeoffs and landings in a tailwheel-equipped airplane. The pilot selected a landing site located on a ridgeline and assessed the ridge and wind conditions prior to attempting to land. On his first landing attempt he landed long and aborted the landing to set up for another attempt. On the second landing, the pilot landed long again, but did not initially attempt a go around. During the landing roll, the airplane bounced about 15 ft in the air, and then the pilot applied full power to abort the landing; however, the airplane was too slow, and the pilot lost directional control. The airplane subsequently struck the ground in a nose low, left wing low attitude, resulting in a nose over. The airplane sustained substantial damage to the left wing, fuselage and empennage. The pilot reported no pre-impact mechanical malfunctions or failures with the airplane that would have precluded normal operation.