Hotel Julien Spa sits in the vaulted cellars of a boutique hotel on Korte Nieuwstraat in Antwerp's old town. It has a hammam, a sauna, a hot-stone bench and a rain shower with a waterfall, and only one party is admitted at a time, so a booking gives private use of the space. The spa is open to locals as well as hotel guests, daily from 9:00 to 22:00 by advance reservation; spa access is booked separately from rooms and treatments.