A sacred fountain, possibly dedicated to a Roman goddess, hints at the origins of the elaborate Roman Baths that grew up around a natural hot spring in what is now the city of Bath. Luck and geography managed to protect the site, considered to be the best preserved religious spa from the ancient world.
The complex now also includes the 18th century Pump Room, where fashionable people once socialized and "took the waters". Most of Jane Austen's novels, sooner or later, involved a "season" of high class husband hunting in Bath. You can still drink from Bath's natural hot spring before lunching in the Pump Room.