Admire the city walls before entering. The first defenses were erected at the end of the Bronze Age. When David became King of Israel circa 1000 BC, he constructed walls. They were ravaged in 587 BC. This cycle of building and destruction occurred several times for two millenniums. The current Walls of Jerusalem were constructed by the Ottoman Empire in the 16th century. They measure 2.5 miles long and average almost 40 feet tall. Zion Gate is one of seven into the Old City. It dates from 1540. Other names are King David’s Gate and the Jewish Quarter Gate.