Carrickkildavnet or Kildavnet Castle is a tower house located in the southeast corner of Achill Island, across from the Corraun Peninsula. This is an important strategic site, protecting the mouth of Achill Sound and the passage that connects Clew Bay with Blacksod Bay.
Carrickkildavnet Castle was built c. 1429 by the Ó Máille (O'Malley), Kings of Umaill. It was later the stronghold of Gráinne Ní Mháille (Grace O'Malley, c. 1530 – c. 1603), the famous 'pirate queen.'
It is a tower house of four storeys' height. It is vaulted above the first floor and a hole at the corner of this vault is the only access to the higher levels, presumably for defensive reasons. Other defensive features include a mural chamber, machicolation, defensive loops, buttress fortifications at the top and a ruined bawn wall.
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.