Uniqueness. Dating from the 1940's and designed by the famous Portuguese modernist architect Cassiano Branco, the Hotel Britania is the only hotel of that period which has survived intact. The original Art Deco ambiance has been restored and the hotel is now classified as an historic building. Centrality and tranquillity. Found in a quiet street just off Lisbon's main avenue, Avenida da Liberdade.