The "Historical Garden" near the city center between Kirchstrasse, Hochstrasse and Merowinger Platz was opened in October 2019 and is freely accessible to visitors. In the middle of the densely populated core city, the green area offers an idea of the historical horticultural culture while emphasizing the historical excavations. With regard to the selection of plants, specific use is made of species and varieties that were already available at the time of the Romans and in the Middle Ages.