Museums in Germany are commonly shut on Mondays (you can find exceptions); the exact opening hours on other times rely upon the museum. If you need to check out a museum over a public holiday, Look at with them right before To make sure they open on that working day. https://technikzon.de/2024/07/19/vorteile-von-it-support-fur-unternehmen-effizienz-sicherheit-und-kundenbindung-steigern/