Sintra is in the district of Lisbon. The town is a UNESCO World Heritage Site on account of its 19th century Romantic Architecture. Attractions include the fabulous Pena Palace (19th c.) and the Castelo dos Mouros (reconstructed 19th c.) with a breath-taking view of the Sintra-Cascais Natural Park, and the summer residence of the kings of Portugal Palácio Nacional de Sintra (largely 15th/16th c.), in the town itself. The potentialities of the Sintra district are not confined to the wild enchantments of the Serra, sometimes wreathed in mist, and to the artistic heritage of the Old Town, described by Byron as "the most pleasing in Europe", but also include valuable archaeological remains, particularly from the Roman period, ancient manor houses, churches of personalized artistic value and characteristic villages. Sintra surroundings are also well known by the golf courses, and amazing beaches (Azenhas do Mar)