The Great Hall is a large chamber with an enchanted ceiling that mirrors the sky outside.

It's quiet, and most of the students use it to study. Occasionally there's a someone trying to hide or play a prank, but they're soon caught and kicked out by the stern librarian.

Get in any kind of scrape at Hogwarts and you'll end up in the capable hands of the School Nurse.

The Room of Requirement is a magical room which can only be discovered by someone who is in need. To make it appear you must walk past a section of blank wall three times concentrating hard on what is needed.