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Since other contributors are charging about on their hobby horses I'm going to mount mine and join the melee.
Another explanation is that these and similar sites such as the Egyptian pyramids, Mayan temples etc. are boondoggles. Financed by the local rulers to keep their subjects occupied so they don't ferment revolution. Generally the local oligarchy will have concocted some type of mumbo jumbo to justify their social position and then they finance public works to get as many people as possible complicit in maintaining the ideology which underpins the status quo.
Something is not right. This message is just to keep things from messing up down the road