I found Prague's famous astronomical clock impossible to photograph. There is simply so much to take in, which I couldn't collect into one photograph. Every hour, starting at 9 am and continuing until 11pm, a parade of characters move above the clock, peering out to world as they pass a small window. To one side a rooster crows and flaps his wings as a skeleton rings a bell. Unfortunately, it's all over in some 30 seconds, until the next hour strikes.... I was lucky, for our guide had found us a perfect place to stand. The Old Town Square is perennially crowded, no more so than when the hour approaches. The only time I saw the square empty was on an early morning walk as I set out to photograph Charles Bridge before all the tourists arrived. Perhaps because it was 3 degrees C the square was almost empty. Installed in 1410, Prague's clock is the third oldest such clock in the world, and the oldest astronomical clock which still functions. The dials sh...