


Pisa Cathedral is a medieval Roman Catholic cathedral dedicated to the Virgin Mary's Assumption. White marble was used to construct the cathedral, baptistery, and bell tower. Many of the standard elements of Romanesque architecture can be found on the front elevation, including dozens of round arches surrounded by geometric stonework. Although the church's exterior has many windows, they are all small and do not provide much natural light. This is because the walls of Pisa Cathedral are the only thing that supports the roof above, so they had to be thick and sturdy, with only small openings for windows.
Speyer Cathedral is a Romanesque Cathedral located in southwestern Germany. The cathedral's construction began in 1030, and the exterior is made of a distinct red sandstone. The majority of the church dates from the late Romanesque period, but the Narthex and front facade were both added in the nineteenth century. The work was done in a Neo Romanesque style, giving the church a cohesive appearance. The church also contains a Barrel Vault which is a significant characteristic in Romanesque architecture
The term Byzantine architecture refers to a variety of buildings that were built during the Byzantine Empire (330 AD 1453 AD). The Byzantine era began in 330 AD, when Roman Emperor Constantine relocated the Roman Empire's capital to Byzantium The Eastern Roman Empire was renamed the Byzantine Empire after that. Byzantine art and architecture spread from east to west across the European continent.
Byzantine architecture has three main characteristics The first is the domed roofs. The squinch (an arch in each of the corners of a square base that transforms it into an octagon) or the pendentive (triangular segments of a sphere that spread at the top and taper to points at the bottom) were both used to allow a dome to rest above a square base. The Greek cross plans were another key characteristic. Architects designed the floor plans for Byzantine churches in the shape of a cross. The church's narthex (or entrance) began with a long walkway forward over the cross in square plan, and stretched out horizontally near the pulpit Lastly, Byzantine architecture featured iconography. Much of the Byzantine church architecture is adorned with early Christian art. The interiors of these churches are decorated with frescoes, ivory carvings, and Byzantine mosaics.
The Hagia Sophia was constructed between 532 and 537 to replace an early 5th century church that was destroyed by fire during the 523 Nika riots. Its interior is lavishly decorated with mosaic and marble. When it was finished, it was the largest church in the world, a title it held until the Ottoman conquest of the Byzantine capital. Following the fall of Constantinople in 1453, the basilica was converted into a mosque and used for religious services until it was closed in 1931. Hagia Sophia has then been open to the public as a museum since its reopening in 1935.
HagiaSophiainIstanbul,TurkeyThe Basilica of San Vitale is a late antique church in Ravenna, Italy. It is one of eight structures in Ravenna on the UNESCO World Heritage List. The church's main building is laid out octagonally. Byzantine features include a polygonal apse, capitals, narrow bricks, and an early example of flying buttresses. The church is best known for its vast quantities of Byzantine mosaics.
https://architectureofcities.com/byzantine-architecture https://www.masterclass.com/articles/byzantinearchitectureguide https://www.khanacademy.org/humanities/medieval world/byzantine1/beginnersguidebyzantine/a/iconsanintroduction
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https://architectureofcities.com/romanesque-architecture