1.0 hr
Monument Trail is so named because it is the most direct route to <a rel="nofollow" target="_blank" href="http://hikingsdcounty.com/airplane-monument-arroyo-seco-loop-cuyamaca-rancho-state-park/">Airplane Monument</a>, a Liberty 12-cylinder aircraft engine mounted on stones. The engine is from a DH-4B biplane that crashed on December 7, 1922, killing both the pilot and his traveling companion.<br><br>The trail is a modest climb that offers some good views. Continue 0.1 miles after the junction with the West Mesa Loop to visit the Airplane Monument. The monument is found on the west side of the trail where the Info symbol is located.