It may be rammed with tourists (although not as many as Paris) but Prague is still definitely worth visiting. This image was captured inbetween massive tour groups walking past. The city was largely spared from bombing during WWII, making one of the best preserved medieval city centres in all of Europe. It's easy to wander around on your own but to get a good sense of history there are a couple of free walking tours available which meet by the astronomical clock. I went with the "yellow shirt" one and our guide was knowledgable, funny, and keen to show us the highlights of Prague. The tour lasts about 2.5 hours and the guides work entirely on tips. 
The astronomical clock (the tower on the left) does a little show every hour on the hour and lasts about 1.5 minutes. Personally, I thought it was a bit disappointing and not worth waiting for. Some figurines out of doors in the clock and someone plays a trumpet from the top of the tower. But if you happen to be near the clock on the hour then it's worth having a look.
