San Marino is an enclave in Italy that lies on the border between the regions of Emilia-Romagna and Marche. Its rugged topography is dominated by the Apennine Mountains. The highest point in the region, Monte Titano, is 749 m above sea level. There are numerous castles in the foothills amid scenic landscapes. San Marino is the third-smallest country in Europe after Vatican City and Monaco and is considered the oldest existing republic in the world. The constitution from 1263 remains valid today. The tiny nation is not officially a member of the EU. The stunning location high above the sea and the medieval walled city after which the republic is named make a stop here worthwhile.