I agree about controlling the camera around them is harder than it should be but the walls are about right as they are. In fact if we were looking historically they should probably be a little wider - but it's not a big deal. At this time in history the walls were getting narrower because of better building methods. However those middle-eastern cultures usually still used dried bricks of clay to build their walls wheras many of the more industrious and richer countries could afford stone fortifications coupled with mortar and skilled engineers to piece them together. Those without access to such building materials would build their walls much thicker; according to Herodutus the walls of Babylon were 24 m (80 ft) thick.

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