Piešťany's Roman Catholic church is a quieter stop than the spa island, but it helps round out the town beyond its resort identity. The church stands north of the central spa zone and is best folded into a longer walk through the residential side of Piešťany.
Do not expect a blockbuster interior. The value is in stepping away from the treatment houses and seeing the ordinary town that supports the resort, with parish life, streets, and local routines continuing around the visitors.