5Duomo di Milano, Italy
The Milan Cathedral, or Duomo di Milano, is one of the largest and most intricate Gothic cathedrals in the world. Its construction spanned nearly six centuries, resulting in a blend of styles. The cathedral is adorned with over 3,000 statues, spires, and gargoyles, creating a stunning visual effect. Visitors can climb to the rooftop for a panoramic view of Milan and a close-up look at the architectural details.