Originally opened in 1916, this neoclassical 5-star hotel sits at the edge of Aachen’s old town near the Carolus Thermen thermal baths. Its 900-square-meter Quellenhof Spa features a Finnish sauna, bio-sauna, steam room, indoor pool, and ice grotto. On-site dining includes a brasserie and bar, and the hotel connects directly to the Eurogress congress center.