The entrance for advance ticket holders is different from the entrance for those purchasing tickets on-site. With advance tickets, you can enter directly next to the Giralda Tower, which is wonderful as you don't have to wait in line on a hot day. Seville Cathedral is considered one of the three largest cathedrals in Europe, and its golden main altar inside is truly magnificent. The blend of mosque and Catholic church architectural styles is also very unique. You can see artifacts showcasing different Renaissance and Gothic architectural and decorative styles, making it well worth spending three to four hours to slowly appreciate.