Considering the Landgasthof Marienthal in Erfurt?
A VT member wrote the following comment about visiting Erfurt:
Neue Mühle by Nemorino
The next time I go to Erfurt I am definitely going to take a tour of the New Mill, which is now a technical museum showing how grain milling used to be done, using water power, from around the 1880s.
The exact tour times are written on a blackboard at the front entrance. Usually they are every hour on the hour starting at 10:00 a.m., except on Mondays.