The castle of Kelefa is located about halfway between the current village of Kelefa and the Bay of Oitylo. It was built in 1679 by the Ottomans, in order to contain the Inner Mani region. Some years later, in 1685, the Maniots besieged the castle. They sent messengers to Venice so the Doge could send a fleet to help them capture the castle. The Venetians were currently at war with the Ottomans so they agreed and sent a fleet under Francesco Morosini. As soon the fleets bearing the symbol of St Mark the Ottoman garrison surrendered. A year later the Ottomans returned with a strong force and laid siege to the castle but were driven back. Along with the rest of the Peloponnese, the castle remained in Venetian hands for about 30 years, but in 1715 the Ottomans recaptured the Peloponnese. Around 1780 the Ottomans abandoned the castle, which became derelict.
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.