If you're interested in seeing the Cathedral of Seville, I strongly recommend checking out this…read morechurch first. A ticket at either one is a double entry, and the lines don't compare. Save yourself a heck ton of time and waiting in the blistering hot sun, and get your ticket at the Iglesia del Salvador first. When you want to check out the Cathedral, you'll be able to skip the winding line and walk up to the front with your receipt!
There is an audio option available for this church.
Inside is very ornate and beautiful! Definitely something to check out if you're interested in Spanish history and religion.