Argentta Spa at the legendary Watergate Hotel is Washington DC's premier spa escape, set within a 12,500-square-foot wellness sanctuary along the banks of the Potomac. At its heart is the hotel's original restored indoor saltwater pool, featuring mosaic tiles flecked with genuine silver. Guests can also unwind in a hot tub, sauna, hammam-style steam rooms, and a relaxation lounge, with a full menu of massages, facials, and body treatments available.