The LandesMuseum charts the cultural history of the region back to the days of the Neanderthals. Each of the seven themed galleries brims with fascinating treasures, including a 40,000-year-old Neanderthal skull, a rare blue Roman glass vessel from the 1st century AD, and, in the new "Celts in the Rhineland" exhibit, gold jewelry unearthed from the grave of a Celtic princess.