Regensburg is located in Bavaria, one of the most distinctive regions of the entire nation. It is an ancient city. Settled first by the Celts in prehistoric times, it was a Roman center for centuries and the site of an important bishopric in the Middle Ages and after. Regensburg is now a thriving city of approximately 150,000 and is a major port on the Danube with beautiful and well-preserved architecture as well as striking, modern buildings. It is only a short distance from both Munich and Nuremberg and within easy access of Vienna, Prague, and other major centers of Central Europe.