a city roughly circular, built as a series of seven walled terraces of ascending height on the lower slopes of a mountain. a rocky outcropping from the mountain, 700 feet high and resembling the prow of a ship, divided the city in half ; road tunnels had been built through it on each level. the white tower, 300 feet high, was built on the highest point of this rocky outcropping, close to the sheer drop down to the great gate of the city. 