The sheer red walls of the Alhambra rise from woods of cypress and elm. Inside is one of the more splendid sights of Europe, a network of lavishly decorated palaces and irrigated gardens, a World Heritage Site and the subject of scores of legends and fantasies. Read more: http://www.lonelyplanet.com/spain/granada/sights/castles-palaces-mansions/alhambra#ixzz3CptaiWRS
Valencia Cathedral, Spain. Really worth visiting. The architecture will definitely impress you and then climbing up to a cathedral tower will give you and opportunity to enjoy the beautiful sights of Valencia. The cathedral was started in a year 1262 which makes you wonder what a history this cathedral carries.