10. Basilica of Saint Paul Outside the Walls, Rome, Italy, Europe
Up next on our list of biggest churches in the world is Basilica of Saint Paul Outside the Walls is one of the most famous churches in the world. Millions of tourists go to see it and admire its awe-inspiring architecture and measures. It has an area of 8,515 m2, and it is denominated to Roman Catholic religion. The most interesting thing about it is having one nave and four aisles by eighty columns.
