Pyramids are nowadays considered tombs, or at least sacred places where dead people were put. It's like exploring a cemetery and then take the treasures that are there.
Also, I created the post so nope, it's not just about "exploration", it's about places and locations, if you propose temples, of course I would think religion cause that is the main purpose of temples, outside of weddings and funerals. The franchise itself already has a religious lore, The Watcher for example is integrated in simmers' vocabulary; We have religious elements in the game like Xmas trees, menorahs, hijabs, shrines, island elementals, Myshupotamian dieties, spirits, voodoo dolls. I didn't put temples in the features because exactly of this idea that temples, tombs and other sacred places are just made to be "explored" and their artifacts "collected" (more like stolen).