Oi! You scrolled right off the map! Remember, this website doesn't just go up and down, it goes left right and diagonal as well. If you get lost again just click the center of the compass rose on the bottom right of your screen. :)
now up in
the Grand Ballroom:
Off the main entrance hall is a large stairwell. You can navigate to other rooms using the compass rose in the bottom right of the screen, or by using your keyboard's arrow keys, or by scrolling around with a trackpad. If you press the center of the compass it'll take you back here. If you're looking for a bathroom there's one on the second floor.