Covering an area of some 50 ha, the oval-shaped Titelberg plateau is approximately 1 km long (NW to SE) and 500 m wide. It was occupied continuously for 700 years from about 300 BC. There is evidence of sporadic settlements dating back even further, perhaps to 2000 BC or before. From the 1st century BC and during the Gallo-Roman period, foundations of masonry replaced the earlier, less durable constructions. These, together with the 9-m high earthen ramparts around the periphery, clearly demonstrate the importance of the Celtic oppidum which appears to have been the seat of the Treveri chiefs.
Although some interest had been shown in the site in 1928, serious archaeological excavations began in 1968 and continue today. These have been coordinated by Luxembourg's National Museum of History and Art with the assistance of specialists from the University of Missouri. In particular, the digs have unearthed the main residential area in the centre of the plateau and the public or recreational area, a few hundred meters to the south east. Both are located to the west of the farm road through the site which follows the path of the old Celtic/Roman road. There is also evidence of metal working and coin-minting activities long before the Roman conquest.