When you reach the North 8th Watchtower, you are at the highest point of the wall. The tower is 888 meters (2,913 feet) above sea level, and it is the best point to the view the wall and to enjoy sunrise or sunset, thus it is also named Sun Watching Tower.
Watchtower. Jehovah's Witnesses. Watching the Sun.
JESUS ( IESOUS in Greek ) = 888.