Was ist der Magdalensberg in Kärnten historisch bedeutsam?

Why this is the correct answer

The Magdalensberg, rising 1,059 meters above the Zollfeld plain north of Klagenfurt, was a major Celtic oppidum and subsequently one of the earliest known Roman urban settlements north of the Alps, active from around 100 BCE to 45 CE. Excavations since the 1840s have yielded thousands of artifacts including the famous bronze Juventus figure, fine metalwork, and evidence of iron and bronze trading networks across the Roman world. An open-air archaeological park on the summit allows visitors to view ongoing excavations and reconstructed Roman buildings.