Turku castle is a national monument and one the most remarkable medieval castles in Finland. It's also one of the largest existing castles in Scandinavia. A history of Turku castle begins from the year 1280. The Swedish conquerors of Finland intended it originally as a military fortress.
During 15th and 16th centuries its defences were strengthened and living quarters were added. The castle served as a bastion and administrative centre in Finland. It was also a residence for kings of Sweden, when they visited in Finland. During the struggles for power of Sweden in 14th and 15th centuries Turku castle was several times under siege. Probably the longest one occured in 1364-65, when German lord Albrecht von Mecklenburg besieged it over eight months before Swedish troops surrounded.
The heyday of Turku Castle was in 1556-1563, when King John III of Sweden lived there. During this castle was enhanced to Renaissance fashioned living palace. John III married Polish princess Catherine Jagellon who also lived in Turku short period in 1562-1563. In 1614, when King Gustav II Adolf visited the castle, a tremendous fire destroyed the wooden structure of the main castle almost completely. After this the main castle was abandoned and used partly as a store, partly just stood empty. In the 19th century castle was used as a prison. The last accident beset the castle in the summer of 1941 soon after the Continuation War had begun when an incendiary bomb hit the main castle.
Today Turku castle is Finland's most visited museum, with attendance reaching 200,000 in some years. In addition, many of the larger rooms are used for municipal functions.
The Mosque–Cathedral of Córdoba, also known as the Great Mosque of Córdoba and the Mezquita is regarded as one of the most accomplished monuments of Moorish architecture.
According to a traditional account, a small Visigoth church, the Catholic Basilica of Saint Vincent of Lérins, originally stood on the site. In 784 Abd al-Rahman I ordered construction of the Great Mosque, which was considerably expanded by later Muslim rulers. The mosque underwent numerous subsequent changes: Abd al-Rahman II ordered a new minaret, while in 961 Al-Hakam II enlarged the building and enriched the Mihrab. The last of such reforms was carried out by Almanzor in 987. It was connected to the Caliph"s palace by a raised walkway, mosques within the palaces being the tradition for previous Islamic rulers – as well as Christian Kings who built their palaces adjacent to churches. The Mezquita reached its current dimensions in 987 with the completion of the outer naves and courtyard.
In 1236, Córdoba was conquered by King Ferdinand III of Castile, and the centre of the mosque was converted into a Catholic cathedral. Alfonso X oversaw the construction of the Villaviciosa Chapel and the Royal Chapel within the mosque. The kings who followed added further Christian features, such as King Henry II rebuilding the chapel in the 14th century. The minaret of the mosque was also converted to the bell tower of the cathedral. It was adorned with Santiago de Compostela"s captured cathedral bells. Following a windstorm in 1589, the former minaret was further reinforced by encasing it within a new structure.
The most significant alteration was the building of a Renaissance cathedral nave in the middle of the expansive structure. The insertion was constructed by permission of Charles V, king of Castile and Aragon. Artisans and architects continued to add to the existing structure until the late 18th century.
The building"s floor plan is seen to be parallel to some of the earliest mosques built from the very beginning of Islam. It had a rectangular prayer hall with aisles arranged perpendicular to the qibla, the direction towards which Muslims pray. The prayer hall was large and flat, with timber ceilings held up by arches of horseshoe-like appearance.
In planning the mosque, the architects incorporated a number of Roman columns with choice capitals. Some of the columns were already in the Gothic structure; others were sent from various regions of Iberia as presents from the governors of provinces. Ivory, jasper, porphyry, gold, silver, copper, and brass were used in the decorations. Marvellous mosaics and azulejos were designed. Later, the immense temple embodied all the styles of Morisco architecture into one composition.
The building is most notable for its arcaded hypostyle hall, with 856 columns of jasper, onyx, marble, granite and porphyry. These were made from pieces of the Roman temple that had occupied the site previously, as well as other Roman buildings, such as the Mérida amphitheatre. The double arches were an innovation, permitting higher ceilings than would otherwise be possible with relatively low columns. The double arches consist of a lower horseshoe arch and an upper semi-circular arch.