The Church of San Nicolás de Bari and San Pedro Mártir has recently been restored, revealing a pictorial display that experts have called the Valencian 'Sistine Chapel'. It is amongst the first twelve Christian parish churches in the city of Valencia following the reconquest of Jaume I in 1238. Erected as a parish church around 1242, it was remodelled at the initiative of the Borja family in the Gothic style between 1419 and 1455, with the Gothic rib vault contracting in the central nave. Between 1690 and 1693, the interior was recoated with Baroque decoration and fresco paintings of scenes of the life of San Nicolás de Bari (Saint Nicholas) and San Pedro Mártir (Saint Peter Martyr), designed by Antonio Palomino and painted by Dionis Vidal.
Every Monday the Church of San Nicolás de Bari receives hundreds of visitors who make the “Walks of Saint Nicholas” or Devotion to San Judas Tadeo (Saint Jude Thaddaeus), patron of impossible causes. Its restoration has been classified as 'the most important architectural and pictorial-ornamental work ever carried out anywhere in the world due to the scale of the work and the techniques used', and you can now visit the church with or without a guided tour.
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.