The exuberant, powder-pink Birnau pilgrimage church is one of Lake Constance's architectural highlights. It was built by the rococo master Peter Thumb of Vorarlberg in 1746. When you walk in, the decor is so intricate and profuse you don't know where to look first. At some point your gaze will be drawn to the ceiling, where Gottfried Bernhard Göz worked his usual fresco magic.