Mindboggling exhibits at this treasure-packed museum across from the Kaiserdom include the Goldener Zeremonialhut von Schifferstadt , an ornate gilded hat shaped like a giant thimble, which dates from the Bronze Age (around 1300 BC), and Celtic artefacts such as two bronze wheels (circa 800 BC). In the Wine Museum , an amphora from about AD 325 contains what may be the world’s oldest wine. Emperor Konrad II’s surprisingly simple 11th-century bronze crown is the prized exhibit of the Domschatz (cathedral treasury).