If the description says the bonuses only apply to certain cultures (like Greek, Nomad, Roman etc.) then they are more or less useless to you and destroying it would not affect you in any way. Other buildings simply give bonuses to all factions, and that you can verify if there is no reference to any culture at all.
But of course if you are a true EB fan, you wouldn't destroy a single unique or wonderous building. Unless you're a RPer like many of us here.
Maion
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