It includes the entire Old Town, which is also a UNESCO World Heritage Site, and many sites within and around it. Some of the most notable in the Old Town include the Cathedral which was started in 1421 and is the tallest cathedral in Switzerland, the Zytglogge and Käfigturm towers, which mark two successive expansions of the Old Town, and the Holy Ghost Church, which is one of the largest Swiss Reformed churches in Switzerland. Within the Old Town, there are eleven 16th century fountains, most attributed to Hans Gieng, that are on the list.