Credits: Magical Soul
High up in the top-most reaches of the Castle is a tower dedicated to Ravenclaw House. You come across the entrance in the form of a door on the 7th floor without a doorknob or a keyhole but a bronze knocker shaped like the head of an eagle. If, and only if, you answer the riddle that the eagle presents you correctly, you may gain entrance to the Ravenclaw Common Room. Hey, there's a reason that Ravenclaw is the house for those with brains.
Upon entering the Common Room you see a number of things but mostly you see the floor to ceiling windows that span around the airy, wide and circular room. Beyond their panes you can see what looks like all of Hogwarts' campus and the majestic mountain range beyond. One sweeping look through them and you can see the Forbidden Forest, Quidditch Pitch, The Greenhouses, the Black Lake, and even the shimmering light from the windows in Hogsmeade. At nighttime, the glass reveals the starry night beyond. The walls are covered in blue and bronze silk hangings and the midnight blue carpet covering the floor is decorated with stars just as the domed ceiling.
Placed on the centre of the curved wall is a large fireplace with plenty of navy blue sofas and armchairs placed around it as well as a few book cases and tables. They are there for students to lounge at, as they work on homework, socialize or just relax and enjoy the view between lessons. On a crowded night in the common room the fire place is a good meeting spot if you want to find someone to engage in a rowdy game of Gobstones or plan a party with.
Along the wall you entered there is the Announcements Board where all things will be posted regarding school events, lessons, and homework as well as the Study Tables that are provided for a more structured setting for Ravenclaws to do what Ravenclaws do best. The Grey Lady, the House ghost of Ravenclaw tends to visit this spot especially every now and then. And last but not least, to the right of where the impressive statue of Rowena Ravenclaw herself stands, is the staircase leading to the dormitories. Once you ascend these stairs, going to the right will take you to the ones allotted for the girls and the left will lead you to the ones reserved for the boys. Come in, relax, have fun and make yourselves at home.
Welcome to Ravenclaw, the home of the eagles!