'City wall' in the Bible

Then she let them down by a rope through the window, for her house was on the city wall, so that she was living on the wall.

in the eleventh year of Zedekiah, in the fourth month, in the ninth day of the month, the city wall was breached.

The foundation stones of the city wall were adorned with every kind of precious stone. The first foundation stone was jasper; the second, sapphire; the third, chalcedony; the fourth, emerald;