Definately worth a visit. It is 6 euros each to get in and worth the money. There are a few ruins to see and some history to read but the main thing is the views from the top. It is worth the climb for this alone! Do no miss out on this! It is very windy at the top I was blown from my feet so dont stand too near to the edge! It is tiring though and there are a lot of stairs so consider getting a donkey up if you are not very fit. Coming down it is very slippery as well so be careful but it is definately worth a trip! The views are out of this world!