Which springs did the Romans use?
Hot Springs in Aachen at around 250.
Minster spring (Münsterquelle), Quirinus spring and the Emperor’s spring (Kaiserquelle). The Emperor’s spring fed the Büchel Thermal Baths, while the Quirinus spring used to feed one large and several smaller basins. The hot water for the Minster Thermal Baths comes from the Minster spring, which is located below the Cathedral.