Vitalhotel Alter Meierhof

Floor-to-ceiling windows frame the Flensburg Fjord on the German side, Denmark visible across the water on a clear day. This wellness hotel on the Baltic holds two Michelin Keys and a sandstone, half-timbered facade that reads centuries old but was built in 1999, meaning the plumbing works. A 2,000-square-meter Arabian-inspired spa, thermal baths, and a Shiseido bar handle the indoors; Nordic walking and sailing handle the rest. The brasserie delivers champagne to the spa so you need not leave your robe.