Architectural draftsman Leen Ritmeyer presents the latest view of ancient Jerusalem. The Temple still stands on the highest crest, but not much else looks the same: Two walls, not one, guarded the city, at least on the east. In between were houses, built as the city expanded down the slope. The Gihon Spring was not in an open cave but was protected by a massive 30-foot-tall tower (the Spring Tower), which may have been part of the city gateway (as shown in the drawing) or may have simply been part of the city wall. Water from the spring was shunted into a nearby pool, protected by two freestanding towers (the Pool Towers). Channel II, which had no windows, lay inside the outer city wall; it did not irrigate the adjacent fields, but conducted water to a second pool at the southern end of the city.