A long narrow open-air swimming pool or natatio with a fountain house at one end sat next to the bath building itself – three lofty vaulted halls on the same epic scale as a medieval cathedral.
Eisteddai pwll nofio neu natatio awyr agored hir a chul, a thŷ ffynnon yn un pen, wrth ymyl adeilad y baddonau ei hun – sef tair neuadd gromennog urddasol ar yr un raddfa epig â chadeirlan ganoloesol.