Trier's exceptional world heritage is also evident in the other Roman sites in the oldest city in Germany. The first Römerbrücke, of which a number of timbers are still preserved in the riverbed, serves as evidence of the founding of the city in around 17 BCE. The bridge that was built to succeed it has been continuously extended, and is in use to this day. In the same way the Konstantin-Basilika, the Trierer Dom and the Liebfrauenkirche, which were all of Roman origin, are still integrated into the life of the city and the everyday lives of the people of Trier today. Due to their historical significance and their state of preservation, these buildings impress visitors from all over the world every day and round off a visit to the Centre of Antiquity.