Different views of the city walls. At the river Adaja's side at 1630 meters from sea level, Avila is the highest city of Spain and possesses the longest city walls which still today surround the city (with a longitude of 2,526 mtrs, with a medium height of 12 mtrs, and 3 mtrs thick). But if there is anything which marks deeper than its cold winters, is its medieval ambiance, which is felt in the city's personality. Even in the remotest of the corners, the spirit of the Saint can be felt. The city, as well as its churches, was recognized by UNESCO in 1985 as part of the World Heritage for Humanity.

There is no certain date of construction, although some theories date it as far back as 1090, and some to the second half of the 12th century. In its walls, each of the nine gates has its own history beginning with the Carmen's Gate

In the detail of Avila's first page, the Tower called "The Mule's Square" is the focus of a curious story; it is found in front of Saint Vincent's Church.