The oldest Christian building in Switzerland. Baptism here was performed by dipping in a large basin with diameter of 1.9 metres.
Wikipedia https://fr.wikipedia.org/wiki/Baptistère_de_Riva_San_Vitale
Address 5 Via dell'Inglese, Riva San Vitale 6826, Switzerland
Coordinates 45°54'16.412" N 8°58'15.32" E