The Old City of Berne, federal city of Switzerland and capital of the canton of Berne, is located on the Swiss plateau between the Jura and the Alps. Founded in the 12th century according to an innovative foundation plan, and located on a hill surrounded by the River Aar, Berne has experienced an expansion in several stages since its foundation. This development remains visible in its urban structure, mainly tributary to the medieval establishment and its clearly defined elements: well-defined wide streets, used for the market, a regular division of built sections, subdivided into narrow and deep parcels, an advanced infrastructure for water transportation, impressive buildings for the most part dating from the 18th century mainly built from sandy limestone, with their system of arcades and the facades of the houses supported by arches. Public buildings for secular and religious authorities were always located at the periphery, a principle also respected in the 19th century during the construction of the large public monuments confirming the function of Berne as the federal city from 1848.
Berne developed along the lines of exceptionally coherent planning principles. The medieval establishment of Berne, reflecting the slow conquest of the site by urban extensions from the 12th to the 14th century, makes Berne an impressive example of the High Middle Ages with regard to the foundation of a city, figuring in the European arena among the most significant of urban planning creations. The features of Berne were modified to reflect the modern era: in the 16th century, picturesque fountains were introduced to the city and restoration work was carried out on the towers and walls and the cathedral was completed. In the 17th century, many patrician houses were built of sandy limestone, and towards the end of the 18th century, a large part of the constructed zones underwent transformation. However, this continual modernization, right through to the present day, was carried out observing the need to conserve the medieval urban structure of the city. The Old City of Berne is a unique example demonstrating a constant renewal of the built substance while respecting the original urban planning concept, and presenting a variation of the late Baroque on a theme of High Middle Ages.References:
The city walls of Avila were built in the 11th century to protect the citizens from the Moors. They have been well maintained throughout the centuries and are now a major tourist attraction as well as a UNESCO World Heritage Site. Visitors can walk around about half of the length of the walls.
The layout of the city is an even quadrilateral with a perimeter of 2,516 m. Its walls, which consist in part of stones already used in earlier constructions, have an average thickness of 3 m. Access to the city is afforded by nine gates of different periods; twin 20 m high towers, linked by a semi-circular arch, flank the oldest ones, Puerta de San Vicente and Puerta del Alcázar.