The Courtauld Surprise

Never been to Courtauld Gallery before (I hate this name, don't know how to pronounce it!).
I went there today because I wanted to know something more than just it's location on the map before I'd go there for my Thursday's interview.
How come I didn't even realize what paintings were there?? How is it possible?? Anyway... I was amazed by the art works of impressionists! I think I'm not able to express how I felt having my eyes 10 cm from Seurat's paintings... Unforgettable!