Potions Classroom

The Potions Classroom is a damp and cold room within Hogwarts. During the winter the students can see their own breaths so it's recommended to bring an extra sweater if one is unable to handle the chill. To the back of the room is the student cupboard for supplies and in the front is a chalkboard that is sparingly used save for when the Professor decides to write up instructions. There's a running water fountain if anyone needed to clean themselves of any unfortunate spills. Smells like a hint of student failures and tobacco.

Potions Storage

Behind the blackboard is a trapdoor that leads to the storage room for most of the equipment for Potions. There are a bunch of cauldrons and extra ingredients should students ever need extra. Only the professor is permitted to enter this room to prevent students from snatching any thing, but of course this doesn't stop a couple of the braver ones to venture in when they're up to their own mischief. The room is magically locked.

G. Head's Office

The office for the Potions Master, Professor Stiùbhard-Kirkland, is located within the dungeons. The study has various candles and a magically contained fireplace that keeps the place illuminated. With all the fire around, the room however is cold like most of the other places underground. For the most part, the office is clean and orderly, save for the desk that is settled in the back of the room. Ungraded papers and bottles of students' classwork are stacked on top of each other while underneath the mess of work are scribbles and crossed out stanzas of poetry and prose. There's a lot of non-potion related paraphernalia in the office however, such as that stash of firewhisky hidden to all visitors and many bookshelves filled to the brim with literature of both wizarding and muggle sources. Oh, did I forget to mention? This is the office for the Head of Gryffindor as well.

Alchemy Classroom

Here's another particularly cold room that a number of sixth and seventh years gather for their alchemy classes. There are numerous beakers that litter the students' desks that makes it look more like a muggle's chemistry class than a wizarding one.

S. Head's Office

Here lies the Head of Slytherin's office, open to students that have gained the ire of the professor or for Slytherins to ask for advice. The room is dimly lit and many students try to not spend as much time as possible here.

Kitchens

What a curious painting of a bowl of fruit. Tickle the pear and you'll find the door that will lead you to the kitchens. The place is situated right beneath the Great Hall, with long tables aligned up in the exact position as the room on top. There are numerous House Elves working here, preparing meals and clearing empty dishes, pots, and pans for the next round of eating. If you're lucky enough, you can probably sneak some food after hours into your Common Room.

Boathouse

Here is one of the first places the First Years will get to experience on their symbolic crossing of the lake. The boathouse is a large underground habour that one must enter through a cave. Students arrive here in the beginning of their journey at Hogwarts, and they will leave the same way.