Sintra is a magical town set in the hills of the Serra de Sintra, just northwest of Lisbon. Famous for its romantic 19th-century architecture, the town is home to several exquisite palaces and castles, including the colorful Pena Palace, the Moorish Castle, and the regal Quinta da Regaleira. Sintra's lush gardens, mystical forests, and stunning viewpoints make it a popular day trip destination from Lisbon.