When we went surfing in 2011 in Portugal we had a rental car and decided to go on a sightseeing trip to fairy tale Sintra. As there are several palaces to be visited we had to choose one and we chose the Palacio National da Pena, built by King Ferdinand II. It is said to be the greatest expression of 19th-century romanticism in Portugal, influenced from the Manueline and Moorish styles of architecture, but I would just call it Romantic Disneyland. It is located in the Sintra hills, above the old town and surrounded by a forest and luxuriant gardens.
We not only visited the outside of the castle and the park but also the inside were taking pictures was forbidden. But I don’t recommend spending your time and money on that because it was rather boring. Rather spend more time in the park which also boasts many hidden ruins, temples, bridges and other romantic stuff.
Should I go back there I would definitively love to see the Morish Castle. It looked very exciting (at least for archeology fans like me) and more of the buildings in town. They all look so fancy.