The many palaces, villas and gardens around Sintra, situated in the mountains west of Lisbon, have earned it a place as a UNESCO World Heritage site. The small town is dominated by the Palácio Nacional de Sintra, a royal summer palace that was largely developed in the 15th and 16th centuries and now houses the world's most important collection of mudéjar azulejos (glazed tiles). The palace can be reached by train from Rossio station.
A short trip (4.5km) out of Sintra on the Estrada da Pena takes you to the famous Palácio Nacional da Pena, a remarkable fairy-tale castle standing high on a hill. It was built in 1839, in a mix of Bavarian, Moorish, Gothic and Manueline styles.
For further information, visit Sintra Tourism Office, Praça da República 23.