The Great Hall at Christ Church is the largest pre-Victorian college Hall in Oxford or Cambridge. It seats up to 300 people and hosts meals for the Christ Church academic community. Around the walls are portraits of the many famous members of Christ Church, including a few of the thirteen British Prime Ministers educated at the college.
The Hall inspired the appearance of Hogwart's Hall in the Harry Potter films.
Yeah ... when I first saw it I thought "Oh ... Harry Potter set" :D