Home to a variety of unique and interesting displays, Museum Zeughaus is a fantastic place to discover more about times gone by. Check to see if there are any guided tours available or just wander around at your own pace.
You're spoiled for sightseeing choice when in Mannheim City Centre. Museum Zeughaus is a good place to start here, but there are numerous other worthwhile sights to appreciate. SAP Arena, Luisenpark, and Maimarkt Mannheim are not far from the collection of historical artifacts and will top off your day nicely.