The Standing Stones of Stenness is a Neolithic monument and may be the oldest henge site in the British Isles. Various traditions associated with the stones survived into the modern era and they form part of the Heart of Neolithic Orkney World Heritage Site. Maeshowe chambered cairn is about 1.2 km to the east of the Standing Stones of Stenness and several other Neolithic monuments also lie in the vicinity, suggesting that this area had particular importance.
The Stenness Watch Stone stands outside the circle, next to the modern bridge leading to the Ring of Brodgar.Although the site today lacks the encircling ditch and bank, excavation has shown that this used to be a henge monument. The stones are thin slabs, approximately 300 mm thick with sharply angled tops. Four, up to about 5 m high, were originally elements of a stone circle of up to 12 stones, laid out in an ellipse about 32 m diameter on a levelled platform of 44 m diameter surrounded by a ditch. The ditch is cut into rock by as much as 2 m and is 7 m wide, surrounded by an earth bank, with a single entrance causeway on the north side. The entrance faces towards the Neolithic Barnhouse Settlement which has been found adjacent to the Loch of Harray. The Watch Stone stands outside the circle to the north-west and is 5.6 m high. Once there were at least two stones there, as in the 1930s the stump of a second stone was found. Other smaller stones include a square stone setting in the centre of the circle platform where cremated bone, charcoal and pottery were found. This is referred to as a 'hearth', similar to the one found at Barnhouse. Animal bones were found in the ditch. The pottery links the monument to Skara Brae and Maeshowe. Based on radiocarbon dating, it is thought that work on the site had begun by 3100 BC.
The Heart of Neolithic Orkney was inscribed as a World Heritage site in December 1999. In addition to the Standing Stones of Stenness, the site includes Maeshowe, Skara Brae, the Ring of Brodgar and other nearby sites.References:
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.