2. Alhambra in Granada
This giant fortress will take an entire day to walk around, but make sure you do it as you will find it as a highlight on any European guide on things to do. The first Nasrid king, El Ahmar, chose this building as it overlooked the entire city of Granada, offering you a great view for some quick snaps. The price for entry is around 13 euro’s, while it is about 9 euro’s for children (I’m pretty certain they offer a student discount if that helps). Alhambra is only ever fully open between March and October, so make sure you time your visit perfectly, as you would be disappointed through the winter.