During the Middle Ages, Rostock was fortified by tall walls and over 20 gates. The most impressive one was and still is the Kröpeliner Tor. This brick Gothic structure stands 177 feet on a historic street named Kröpeliner Straβe. Since the tower was built in 1270, it has been expanded and restored several times. For years a tram ran through the arch. Today, Kröpeliner Tor houses the Rostock History Workshop. They manage the town’s fortifications plus offer a library and displays about their history.