Sintra, the former residence of the Portuguese kings, is so rich in magnificent monuments that it is unlikely that you will be able to see them all during one sightseeing excursion with a English-speaking guide. However, in any case, the list of must-see places includes three palaces: the National Palace, Pena, and Montserrat, as well as the huge estate of Quinta da Regaleira with many sights (1001guide recommends paying special attention to the palace, the chapel, and the mysterious Well of initiation).