The Cathedral of Cefalù is one of nine structures included in the UNESCO World Heritage Site known as Arab-Norman Palermo and the Cathedral Churches of Cefalù and Monreale.
The cathedral was erected between 1131 and 1240 in the Norman architectural style, the island of Sicily having been conquered by the Normans in 1091. According to tradition, the building was erected after a vow made to the Holy Saviour by the King of Sicily, Roger II, after he escaped from a storm to land on the city's beach. The building has a fortress-like character and, seen from a distance, it dominates the skyline of the surrounding medieval town. It made a powerful statement of the Norman presence.
The façade is characterized by two large Norman towers with mullioned windows, each surmounted by a small spire added in the 15th century. Each spire is different: one has a square plan surrounded by flame-shaped merlons, the latter symbolizing the Papal authority and the mitre and the other has an octagonal plan and Ghibelline merlons, symbolizing the royal and temporal power.
Inside the cathedral the dominant figure of the decorative scheme is the bust of Christ Pantokrator, portrayed on the semi-dome of the apse with a hand raised in Benediction.
The basilica houses several funerary monuments, including a late Antique sarcophagus, a medieval one, and the notable sepulchre of the Bishop Castelli of the 18th century.
Excavations in the cathedral area have brought to light parts of a 6th-century polychrome mosaic. They depict a dove drinking, parts of two other birds, two small trees, and a lily-shaped flower, enclosed in a frame with ogival and lozenge motifs. This mosaic belonged probably to a pre-existing Byzantine basilica.
References:Kristiansten Fortress was built to protect the city against attack from the east. Construction was finished in 1685. General Johan Caspar von Cicignon, who was chief inspector of kuks fortifications, was responsible for the new town plan of Trondheim after the great fire of 18 April 1681. He also made the plans for the construction of Kristiansten Fortress.
The fortress was built during the period from 1682 to 1684 and strengthened to a complete defence fortification in 1691 by building an advanced post Kristiandsands bastion in the east and in 1695 with the now vanished Møllenberg skanse by the river Nidelven. These fortifications were encircled by a continuous palisade and thereby connected to the fortified city. In 1750 the fortress was modernized with new bastions and casemates to protect against mortar artillery.