Imperial Cathedral in Mainz
The cathedral, founded by Archbishop Willigis in 975, is the oldest monumental vaulted building in Germany after the Speyerer and before the Worms. Within the cathedral, some memorabilia, such as old tombs or altars, have accumulated over time. Unique is the underground Nassauer chapel. On the cloister were probably buried around 250 people, in whose upper floor is today the Episcopal Cathedral and Diocesan Museum Mainz.