The Cathedral of Seville is the largest Gothic cathedral in the world and is a must-see attraction in Seville. The cathedral has beautiful stained glass windows, intricate carvings, and a stunning altarpiece. You can also climb to the top of the Giralda tower for a panoramic view of the city. The cathedral is a great place to visit on a rainy afternoon as you can spend hours exploring the different chapels and admiring the beauty of the building.