Tzistarakis Mosque was built in 1759, by the Ottoman governor of Athens, Mustapha Agha Tzistarakis. According to tradition, Tzistarakis used one of the pillars of the Temple of Olympian Zeus to make lime for the building, although it is more likely that he used one of the columns of the nearby Hadrian's Library. This act led to his dismissal as the Turks considered it a sacrilege which would cause vengeful spirits to be loosened upon the city, a superstition that some Athenians believed to have been confirmed when there was an outbreak of the plague later in the year.
During the Greek War of Independence, the building was used as an assembly hall for the local town elders. After Greek independence, it was used in various ways: thus it was the site of a ball in honour of King Otto of Greece in March 1834, and was also employed as a barracks, a prison and a storehouse.
In 1915, it was partly rebuilt under the supervision of architect Anastasios Orlandos, and was used to house the Museum of Greek Handwork from 1918 until 1973. In 1966, it was provisionally refurbished to provide a place of prayer during the stay of the deposed King of Saudi Arabia, Saud, in the city.
In 1973, the main functions of the Museum of Greek Folk Art moved but the V. Kyriazopoulos pottery collection of ceramics remains in the mosque to this day.
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.