Aarau
A few artifacts from the Neolithic period were found in Aarau.  Near the location of the present train station, the ruins of a settlement from the Bronze Age (about 1000 BC) have been excavated.  The Roman road between Salodurum (Solothurn) and Vindonissa passed through the area, along the route now covered by the Bahnhofstrasse.  In 1976 divers in the Aar found part of a seven-meter wide wooden bridge from the late Roman times.