>>980510You have to pay 1.00 to 1.50 € and climb up 37m of stairs to the tower. Then you can just hang out there as long as they're open, which is from 10 AM to 6 PM. It is very cool.
Here's a picture of the city center up north. The same tram line runs east in front of that church with the two belfries and then turns north again, along the area with trees.