Why all Temples, Mosques, Churches, Gurudwaras, etc have a structure such that the main area on the ground is broad and on top it is pointed something like '/\'. This upper part varies a bit in shape like rounded or conical according to the religion but they are almost similar and this particular upper part shape is not build for normal houses.
So, my confusion is about this upper part of the temples. Is it just to make them different from normal houses or there is some significance of it for shaping it like this?