The Cathedral of St. James in Šibenik is a triple-nave basilica with three apses and a dome. It is the most important architectural monument of the Renaissance in the entire country. Since 2000, the cathedral has been on the UNESCO World Heritage List.
The building of the church was initiated in 1402, though plans on its construction had already begun in 1298, when Šibenik became a municipality. The actual work to transform the older Romanesque cathedral began in 1431. Built entirely of stone (limestone from a nearby stone quarry and marble from the island of Brač), it was completed in three phases, from 1433 to 1441, when the Grand City Council entrusted the work to local and Italian masters Francesco di Giacomo, Lorenzo Pincino, Pier Paolo Bussato, Bonino da Milano, and Giorgio da Sebenico (Juraj Dalmatinac) and to Croatian ones Andrija Budčić and Grubiš Šlafčić.
Its beauty is especially emphasized by the imposing Renaissance dome, the work of Niccolò di Giovanni Fiorentino, which was damaged in the Croatian War of Independence, and nowadays is a special symbol of Šibenik.
The Cathedral is also known for its iconographic innovations, among which a special place is occupied by sculptures of 71 heads on the outside part of the shrine, the work of Georgius Mathei Dalmaticus, for which scientists are still not quite sure who they represent.
The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.