TAGS: most romantic places on the earth, best romantic places to visit, romantic trips, irresistible romantic places in the world,best romantic destinations in the world, special romantic places, best romantic cities in the world, best tourism in Sintra, great attractions in Sintra, the National Palace, Palacio da Pena, Palacio de Monserrate, Quinta da Regaleira, Castelo dos Mouros, Sintra, Portugal