Year 6 - Normandy, France.
Year 7 (secondary school) - funnily enough, the exact same youth hostel in Normandy, France

Year 8 - was supposed to go camping but camping is ghastly so we were allowed to go wild and play sports and stuff.
Year 9 - Cologne, Germany

might be the best time of my life. Really good fun, pretty much made my current group of friends there. Also had stops off in Ypres, Belgium, Bonn, Germany and Maastricht, Holland.
Year 10 - there was a business studies trip to Barcelona but I didn't go. Wish I had

Year 11 - can't remember there being one.
We also went to the Millenium Dome in primary school when it opened, and the rest have been history/geography trips to nearby landmarks.