Here are the four hourglasses keeping track of the houses points.

With a high enchanted ceiling to show the weather outside, students eat and catch up here. Each house has their own table and the staff have theirs. That doesn't stop you from going to talk to a friend in another house though.

Here is where the Centaur, Firenze teaches Divination. You'll only get him if your in 3rd or 5th year. Otherwise you have Professor Trelawney

A great make-out secret spot. Though Filch does seem to lurk around the area around it a little too much.

Or your in trouble or a trouble maker if your in here. This office is more like a Dungeon than anything else. With chains hanging from the ceilings and filling cabnets full of misdeeds and confiscated items, you don't want to be here.