<p>This luxurious hotel occupies the former headquarters of the Circle of the Mercantile and Industrial Union of Madrid. Built in 1924, the historic building is defined by a stone fa&ccedil;ade decorated with neo-Renaissance motifs and a tower with a pointed dome. Inside, a marble staircase ascends the first three floors around a soaring atrium, where the original 1920s chandeliers still hang. A 2017 renovation brought modern design to each of the 71 guest rooms and social spaces. Before (and after) hitting the casino floor, guests can relax in the hotel&rsquo;s &ldquo;living room,&rdquo; furnished with plush chairs and decorated furniture; dine at C&iacute;rculo Mercantil Restaurant, where avant-garde cuisine is paired with views over the Gran Via; enjoy champagne, oysters, and caviar at the Champagneria &ldquo;bubble bar&rdquo;; and take in Madrid&rsquo;s many sights from the sixth-floor terrace cocktail bar.</p>