The Pena National Palace, São Pedro de Penaferrim, municipality of Sintra, Portugal.... http://www.castlesandmanorhouses.com .... The Pena National Palace, in Portuguese the Palácio Nacional da Pena, is a Romanticist palace on the top of a hill above the town of Sintra. On a clear day it can be easily seen from Lisbon. It is a national monument and notable expression of 19th-century Romanticism. The palace is a UNESCO World Heritage Site and one of the Seven Wonders of Portugal.