Castelo dos Mouros in Sintra

For breathtaking views head for Castelo dos Mouros in Sintra. Located on the way to Palácio da Pena, it can be reached on a tuk-tuk or on foot if you don't mind the walk (roughly 45 minutes from the bottom of the hill.) There are some trails that lacks signs, but on the day of my visit, I saw plenty of people heading to the same place and I just confirmed I was on the right track with them. Entry is 8 euros and cards are accepted. The ticket vending machine doesn't work, so go through the stone passageway opposite the vending machine and walk along the path to find the entrance and ticket office. You need at least 45 minutes to visit the place. Walk along the the wall and enjoy the stunning views.