To destroy or not to destroy (unique buildings)

[Aemilius Paulus]

apparently you can demolish the mountain in sarmiszegethusa

That is messed up. I agree.

IIRC, then you can "destroy" those unique lakes in Tolosa as well.

But this is not. For one, draining lakes is usually quite simple in comparison. Unless they are mountain lakes, as those can be formed in natural pits in the solid rock. But anyway, the reason why that lake can be drained is because tonnes of valuables were sacrifice there. In the building description it says that you can either destroy (drain) it for money or leave it for happiness (Which it does give you regardless of your faction.

As for myself, I used to destroy useless unique buildings (including the ones with morale and/or trade bonuses, as both did not work), but now I do not destroy anything. I like the uniqueness.