Nifty city! Was it built on the head of a giant beetle? Is there a rumor/myth that it was built on the head of a giant beetle? I'm saying it kind of looks like it was built on the head of a giant beetle.

Maybe the lack of gate to the temple is a test of faith? If you believe, you can walk through the wall at a certain place. Or maybe it's a temple of a sky-god and the faithful can fly over the wall. Or there could just be a tunnel or a door (or doors) smaller than a major gate and therefore lacking towers.