The Castelo dos Mouros offers astounding views of the hills around Sintra and of the Atlantic Ocean. But watch out for slippery stones on the castle walls (especially when wet) as it's a long way down if you fall! When I went there was mist over the hills which made it very eerie.

Pena Road. About 3.5 km from Old Quarter, on the road to Pena Palace (buses go from Sintra's train station);
Regular trains from Sete Rios station or Entrecampos station (Estação Rossio closed at time of writing). Journey time is less than an hour;
www.portugalvirtual.pt/_tourism/costadelisboa/sintra

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