Nisa is a small Alto Alentejo town close to the Spanish border, in a landscape of granite, cork oak, dry fields and old defensive lines. It is not a polished show town like nearby Castelo de Vide or Marvao, but it has a frontier identity of its own.
The town centre keeps pieces of its medieval walls and castle, and the wider municipality holds two stronger fortress stops: Amieira do Tejo above the Tagus and Montalvao near the border. Together they make Nisa useful for travellers tracing the defensive towns of eastern Portugal rather than just ticking off the famous names.
Come with a car and a taste for quiet places. Nisa works best as a half-day or slow-day base between Castelo Branco, Portalegre and the Tagus valley, with time for the old centre, local cheese and one or two of the outlying castles.