The Duomo Cathedral of Milan is a Catholic church in Milan, Italy, and holds the title of second-largest cathedral in the world. It was started in 1386 by Archbishop Antonio da Saluzzo and Lord of Milan Gian Galeazzo Visconti, who founded the Fabbrica del Duomo to build it.
Most people aren’t surprised to learn that the largest cathedral in the world is located in the heart of the Vatican. To get even close to St. Peter’s record, however, they’d have to challenge the second-largest Catholic cathedral in the world, the Duomo di Milano. Located in the northern Italian city of Milan, this massive edifice is one of the most breathtaking and intriguing structures in Europe. Constructed steadily over nearly six centuries and featuring design elements from numerous styles, it’s a fascinating cathedral unlike any other.