Long the home of Portugal’s monarchs, Sintra is a magnificent town of marvelous historic mansions, all set against the backdrop of lush hills. Sintra’s many castles include the Palácio Nacional de Sintra (a main abode of Portuguese royalty until the early 20th century), the hilltop and storybook Palácio da Pena, Quinta de Regaleira (incorporating several architectural styles and with gorgeous surrounding gardens), the Castelo dos Mouros (Moorish Castle), and the Palácio de Monserrate.