Seville is a very beautiful city known for its mix between arab and cristian that you can see all over the city. There are lots of things to do in Seville but the most important places to visit are:
The Cathedral: Its the 3rd biggest cathedral in the world. It was built in the 16th century. It contains the Giralda, a tall tower from which you can see Seville perfectly. It's a very good place to take photos and to do a bit of sport because you have to climb 34 slopes to get to the top of the Giralda. It was registed as a World Heritage Site in 1987 by UNESCO..
The Alcazar: It's an islamic palace with a huge beautiful garden where you can see where the arab king used to live. It's the oldest royal palace still in Europe, and it is also a World Heritage Site.
Maria Luisa's Park: It's the most famous park in Seville. Recently it has been declared Cultural Interest Good and it's also part of the Historical Heritage of Spain.