The Oppidum d'Ensérune is an ancient hill-town (or oppidum) near the village of Nissan-lez-Ensérune. The settlement was occupied without interruption between the 6th century BC and 1st century AD, its location being chosen presumably because it was a hill with good views over the coastal plain, being close to the Roman road Via Domitia, the Montady lake, and fertile agricultural land below.
There is a museum on the site which offers a display of some of the finds on the site, as well as giving more information about the fort and the field system.
Below the Oppidum was the swamp of Montady, which is now wedge shaped fields separated by irrigation ditches that converge in the centre. In the 13th century, the swamp was drained; the ditches allowed water to flow to the centre of the circular depression, from which it was conveyed through underground pipes several kilometres to the south. The drainage is still functional and remains in use.
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.