The amphitheatre of Catania is the most complicated and largest of all the amphitheatres in Sicily. It was built in the Roman Imperial period, probably in the 2nd century AD, on the northern edge of the ancient city at the base of the Montevergine hill. Only a small section of the structure is now visible, below ground level, to the north of Piazza Stesicoro.
The external diameter was 125 x 105 metres, while the external circumference was 309 metres. From the theatre's dimensions it can be calculated to have held 15,000 spectators and almost double that number with the addition of wooden bleachers for standing spectators. According to an uncertain and unconfirmed tradition, it was intended that naumachiae (staged sea battles) take place in the amphitheatre, using the ancient aqueduct to fill the arena with water.
According to Cassiodorus, in the 5th century, Theodoric, King of the Ostrogoths, allowed the inhabitants of the city to spoliate the theatre for building material for the construction of stone buildings.
In the 13th century, according to tradition, the amphitheatre's vomitoria (entranceways) were used by the Angevins to enter the city during the Sicilian Vespers. In the following century, the entrances were walled up and the ruins were incorporated into the Aragonese fortifications (1302).
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.