11. Basilica-Cathedral of Our Lady of the Pillar, Zaragoza, Spain, Europe
It is a Roman Catholic church with an area of 8,318 m2 and was built for 191 years, from 1681 to 1872. It has a unique point of interest as several churches have been built on this site: at first, the church was Romanesque, then it was transformed into Gothic later into Mudejar style.
