Lotrščak Tower (Zagreb)
The midday gun
If you hear a bang a 12 o'clock and see the pigeons in a panic, you have just heard the midday gun. Any tour guide in Zagreb will make sure you are at the tower at midday to hear the gun which has gone off every day since 1876. It is loud, but it will not deafen you. There are great views of Zagreb up there and if you don't like the thought of walking there there is a short funicular on the south side.
Very good for orientation
Very interesting little tower with old wooden stairs, incredible view on the top. You can check the whole city of Zagreb and it's very good for orientation. They also have old photos of the city inside the tower.