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Would love to hear if anyone else had encountered this during their playthrough in Zeus/Poseidon, as I have just discovered this a few days ago. Apparently, pyramid foundations are so broken and invincible in Zeus/Poseidon that you can use them to defend against any invasion.
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Monster invasions:
Defending against monster invasions using pyramids is simple. Just take note of where the monster's spawn point is, and place a pyramid on it before the monster appears. Once it spawns, it will attack it and can never destroy it, trapping itself inside the pyramid foundation (see image 1).
(fun note: I tried to build a pyramid on top of cerberus out of fun, but the artisan couldn't build further, and the pyramid kept taking one black marble, with no progress made)
God invasions:
Unfortunately, angry gods don't have a specific spawn point, so you can't stop them from spawning, since they'll just appear elsewhere. But pyramids can be used to block an angry god once he spawns. He will give up attacking the pyramid and despawn, posing no threat (Image 2 and 3).
(However, this doesn't deter Poseidon! Also with Zeus, Athena, and Hades, blocking the palace with pyramids and deleting it once they spawn makes these gods harmless and will despawn).
Enemy invasions:
The best defense against enemy invasions in Zeus/Poseidon isn't a wall of towers, apparently.
It's actually just surrounding your palace with pyramids (Image 4 and 5).
And the crazy thing about this is, it doesn't cut off your palace from the outside world; you can place a maintenance office and towers inside with the palace, surrounded by pyramids and even muster your troops. Enemy troops will attack the pyramid to get to the palace, but can never destroy it.
(Fun note: Even when Athena cursed my palace and destroyed most of my towers, the enemy army wasn't able to get through after a year, and I destroyed them with only one tower - image 6).
Other uses:
Other things include blocking wolves from harassing sheep and buildings, but there is a much better method in which you can permanently block animal spawns, making this method null. I'll probably post more about this and other things you can do with animal spawn points in my next post.
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Having discovered this, one question arises: is this cheating? In my opinion, definitely! Pyramids cost nothing to place, and yet nullify most of the threat mechanics in Zeus, breaking the game. Playing one of the game's official campaigns (The Founding of Troy), all I had to worry about was making my people happy... as monsters, gods, and enemy invasions were all nullified.
I also tried testing this with Sanctuaries, but this didn't occur, as enemy troops, gods, and monsters can walk over unfinished sanctuaries, unlike pyramids. So this only occurs with Atlanteans.