A spa town is a resort town based on a mineral spa (a developed mineral spring). Patrons visit spas to "take the waters" for their purported health benefits.
Thomas Guidott set up a medical practice in the English town of Bath in 1668. He became interested in the curative properties of the hot mineral waters there and in 1676 wrote A discourse of Bathe, and the hot waters there. Also, Some Enquiries into the Nature of the water. This brought the purported health-giving properties of the waters to the attention of the aristocracy, who started to partake in them soon after.The term spa is used for towns or resorts offering hydrotherapy, which can include cold water or mineral water treatments and geothermal baths.
