The historic town of Guimarães is associated with the emergence of the Portuguese national identity in the 12th century. An exceptionally well-preserved and authentic example of the evolution of a medieval settlement into a modern town, its rich building typology exemplifies the specific development of Portuguese architecture from the 15th to 19th century through the consistent use of traditional building materials and techniques. Guimarães historic town centre has been listed as a UNESCO World Heritage Site since 2001.
Founded in the 4th century, Guimarães became the first capital of Portugal in the 12th century. Its historic centre is an extremely well preserved and an authentic example of the evolution of a medieval settlement into a modern town, its rich building typology exemplifying the specific development of Portuguese architecture from the 15th to the 19th centuries through the consistent use of traditional building materials and techniques. This variety of different building types documents the responses to the evolving needs of the community. A particular type of construction developed here in the Middle Ages was used widely in the then Portuguese colonies. It featured a ground floor in granite with a half-timbered structure above, a technology that was transmitted to Portuguese colonies in Africa and the New World, becoming their characteristic feature.
The Historic Centre of Guimarães is distinguished in particular for the integrity of its historically authentic building stock. Examples from the period from 950 to 1498 include the two anchors around which Guimarães initially developed, the castle in the north and the monastic complex in the south. The period from 1498 to 1693 is characterized by noble houses and the development of civic facilities, city squares, etc. While there have been some changes during the modern era, the historic centre of Guimarães has maintained its medieval urban layout. The continuity in traditional technology and the maintenance and gradual change have contributed to an exceptionally harmonious townscape.
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Carlsten is a stone fortress built on the orders of King Carl X of Sweden following the Treaty of Roskilde, 1658 to protect the newly acquired province of Bohuslän from hostile attacks. The site of Marstrand was chosen because of its location and its access to an ice free port. Initially a square stone tower was constructed, but by 1680 it was reconstructed and replaced by a round shaped tower. Successive additions to the fortress were carried out, by the inmates sentenced to hard labour, until 1860 when it was reported finished. The fortress was decommissioned as a permanent defense installation in 1882, but remained in military use until the early 1990s.
The fortress was attacked and sieged twice falling into enemy hands. In 1677 it was conquered by Ulrik Frederick Gyldenløve, the Danish military commander in Norway and in 1719 by the Norwegian Vice-Admiral Tordenskjold. At both occasions the fortress was returned to Swedish control through negotiations and treaties.