Avila is about as far as one would want to go on a daytrip from Madrid. The city's main attraction is its medieval wall, almost 2 km (1.5) miles long and still in remarkably good condition. Built into the wall is the cathedral, begun in the 12th century, but requiring nearly 600 years to complete. Just outside the city wall is the Basilica de San Vincente, built between the 12th and 14th century. Almost as large as the cathedral itself, the basilica was supposedly built at the site where Saint Vincent and his sisters were martyred. Their martyrdom is depicted in moving fashion inside the basilica on the martyrs' tomb.