No spa city would be complete without a Nymphaeum — a sacred fountain honoring the water spirits. These structures are typically U-shaped or organized around a semi-circle and later became the model for early Christian baptistries. (Yep, Christianity borrows a lot from paganism.) This particular Nymphaeum’s facade had two stories studded with niches and statues. The building basically acted as the local watering hole, distributing water via pipes to wealthy households.