The room sam spends time in when he is at the bunker. It's his room and no one else's.

The place that houses all the cars including Deans baby and Dorothy's motorcycle.

The hub of the bunker like any place is always the kitchen. Dean has gotten into the habit of cooking and this is where he experiments.

The biggest part of the bunker is the Library. Full of books and files on everything that the men of letters has done over the years.