Free time to move we arrive at the Regensburg History Museum, which displays a large collection of exhibits from the Stone Age to the Middle Ages, showing the yellow history of Regensburg in the Middle Ages. It may be that the exhibits are too old and not so interesting. The ancient pottery and tools are a bit similar to our ancient Chinese ones, which may be inevitable for the development of human history. Some vivid models can tell us how people built those stones in the Middle Ages. It really takes people's ingenuity to put those heavy stones up high without modern tools.