Founded by the Romans in 179 AD as Casta Regina (meaning Fortress by the River Regen), Regensburg is one of Germany's oldest towns. It was relatively spared from Allied bombings during World War II. Today, many flock to see the wonderfully intact old city and its many medieval structures. The 12th-century Stone Bridge was used by Crusaders en route to the Holy Land. The Regensburg Cathedral (or Dom St. Peter) is one of southern Germany's finest examples of Gothic architecture.