The nuraghe Palmavera is classified as a complex nuraghe, that consists of several towers joined together. The nuraghe and the surrounding village were built in various phase during the Bronze Age and the Iron Age.
The main tower dates back to the first phase (15th-14th century BC) and retains the central chamber covered with the tholos and built with stones in limestone. The tower is archaic, with the entrance free of side passages and with the niches just sketched in the walls of the main chamber. There must have been also some huts outside the nuraghe.
In the second phase (first half of the ninth century BC) was added a second tower and restored the previous tower with blocks of sandstone. The two towers communicated through an interior courtyard and a corridor with niches.
It was also built the meeting hut, equipped with a stone seat that runs along the perimeter, interrupted by a tank made of stone slabs, of unknown function, and a round stone seat for the chief, standing next to a niche in the wall. At the center of the hut, on a circular altar, it is present a model of a nuragic tower in sandstone. In this period were also built other huts in the village of higher dimension.
In the third phase (9th-8th century BC), the nuraghe was restored again with blocks of limestone and around it was built an exterior wall with four towers-huts, forming two outer courts, divided by a wall with no openings. In one of these courts it was inserted the meeting hut, in the other has been identified a silo.
The village was destroyed by fire, probably at the end of the eighth century BC and was later sporadically attended in Punic and Roman times, as witnessed by some pottery found.
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.