Parking is available at the nearby Baseltor car park or at the hotel car park.

Baseltor car park: Pisoniplatz, Solothurn (entry for GPS: Pisoniplatz 2)

GPS coordinates: 
47°12'31.9"N, 7°32'24.2"O     
47.208872°N, 7.540070°O

A day ticket for CHF 18 can be exchanged for the entrance ticket at one of the cash machines at any time.