Centro Region, Portugal known as the Princes of Beira. Along the region’s mountainous border with Spain are a series of fortresses and castles that once protected the country from its many invaders. Over the centuries, Moors, Christians, Spaniards and Portuguese have all tried to take these villages, but their higher elevations usually gave them a distinct advantage. On that border, the more than one dozen fortified frontier villages beckon today’s visitors to come explore a 900-year history — full of the heroism, epic battles and romance upon which Portugal struggled to become a nation. Today, Portugal boasts the longest-standing border in all of
Border checkpoint crosses an internal Schengen border is legally not a "border crossing point". Border checkpoint A border checkpoint is a place, generally between two countries, where travelers or goods are inspected. Authorization often is required to enter a country through its borders. Access-controlled borders often have a limited number of checkpoints where they can be crossed without legal sanctions. Arrangements or treaties may be formed to allow or mandate less restrained crossings (e.g. the Schengen Agreement). Land border checkpoints (land ports of entry) can be contrasted with the customs and immigration facilities at seaports, international airports, and other ports of entry.