Just go up by Lühike jalg street and enter a garden via 15th century gate at the very end of the street. There you can find a beautiful sculptures, very interesting old walls and some very special views on the old town. You can find there two ancient towers from 14-15th century - Tallitorn and Neitsitorn. You can climb the first and have a cup of coffee in the Neitsitorn cafe & museum.
Some photos attached