Paderborn's landmark is a stone window on the imposing cathedral, the Three Hares Window, which dates back to the beginning of the 16th century. Even today, every visitor to Paderborn knows the verse, "Three are the spoons and three are the hares, and yet each one has a pair". Directly next to the cathedral are the remains of old imperial strongholds from the Ottonian and Carolingian age. Charlemagne often stopped off in Paderborn. All around the cathedral, more than 200 fountains trace back to the Pader, which empties into the Lippe only four kilometres downstream. The Pader is therefore the shortest river in Germany.
