As one of my roommates pointed out, going to London without visiting the Tower of London is worse- much worse- than going to London without watching the changing of the guards. Probably the single most infamous attraction; this is a hit with all ages. You'll see the famed ravens (legend says the Tower will fall if they leave), the site of various beheadings, and, perhaps most impressively, the Crown Jewels. You ride by these on a little people mover and you can't take pictures, but you won't forget what you see. Prepare for the weather and a good deal of walking here- there's much to explore. Also keep a meeting place in mind. It's bigger than you might think. Either take a guided tour or look around yourself. We were fine on our own but also got very good recommendations from those lead by a fun and friendly guard.

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