Cave hotels , whether deluxe or rustic , make for a unique lodging experience . In Italy , limestone rock houses several underground hotels . Shutting out the world is an ancient tradition at Italy 's Locanda di San Martino Hotel e Thermae , which pays homage to the baths , or thermae , of the Roman Empire . Comment:
Cave hotels , whether deluxe or rustic , make for a unique lodging experience . In Italy , limestone rock houses several underground hotels . Comment: