Sintra is both a town and a municipality in Portugal, located in the district of Lisbon. The town is a UNESCO World Heritage Site on account of its 19th century Romantic architecture.
It has become a major tourist attraction, with many day-trippers visiting from nearby Lisbon. 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 Sintra Mountain Range, one of the largest parks in the Lisbon area, (Serra de Sintra) is also a major tourist attraction.
More Information:
http://www.portugalvirtual.pt/_tourism/costadelisboa/sintra/index.html
http://www.cm-sintra.pt/default.aspx