damascus is the oldest city in the world, there are 3 floors undergrounds, there is not much news about it, but when you enter bab toma you go in a tunnel at left side you can see the first floor down, also in soq alhamadya there is a small tunnel what goes underground, you can walk almost down the hole alhamadya, alse there is in sayd naya the oldest church in the world it on the top of the mountain.