Loevestein Castle (Slot Loevestein in Dutch) is a medieval castle built by the knight Dirc Loef van Horne (hence 'Loef's stein') between 1357 and 1397. It was built in a strategic location where the Maas and Waal rivers come together. At first it was a simple square brick building, used to charge toll from trading vessels using the rivers. In the 16th century (around 1575, orders given by William the Silent) it was expanded to a larger fortress surrounded by earthen fortifications with two (later three) stone bastions on the northern side, two moats, an arsenal, and housing for a commander and soldiers.
Loevestein changed hands twice between the Northern Dutch and the Spanish (December 9, 1570 it was taken by the Geuzen, ten days later Spanish again, and from June 25, 1572 Dutch till this day), the warring parties of the day. The castle became a prison for political prisoners in 1619. One famous inmate was the eminent lawyer, poet and politician Hugo de Groot (Hugo Grotius) often presented as the 'father of modern international law', who was serving a controversially imposed life sentence from 1619. In 1621 Hugo de Groot managed to pull off a daring escape in a book chest. The idea for this escape came from his wife Maria van Reigersberg (also living in the castle). He subsequently became the Swedish Ambassador to France for 10 years. Another high profile inmate was the English Vice-Admiral George Ayscue.
Until the Second World War Loevestein Castle was part of the Nieuwe Hollandse Waterlinie, the main Dutch defense line that was based on flooding an area of land south and east of the western provinces. Currently the castle is used as a medieval museum and function centre.
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.