The House of Arts is the town's main cultural venue, set close to the river and spa park. It is not an ancient sight, but it matters in Piešťany because the town's social life has always revolved around concerts, theatre, and visitors with time in the evening.
Check the programme if you are staying overnight. A performance here gives the spa town a different texture after the day-trippers have left, and the building itself is a useful marker on a riverside walk.