Locanda di San Martino
Situated at the bottom of the Sassi ravine on Via Fiorentini (limited car access), the Locanda is a more upscale cave-dwelling hotel, with all modern comforts, including an elevator to whisk you up the cliff to your room. The owners have even created underground thermae romanae (Roman-style baths) with a series of pools heated to different temperatures, a dry-heat room, a steam room, and hydromassage. Guest rooms are on four levels and are simply furnished to conform to the original cavern atmosphere—the view from your terrace is like something out of a movie.