Detail of a painted trompe-l'oeil, Pena National Palace, Sintra, Portugal (photo)

The Pena Palace is a Romanticist castle in São Pedro de Penaferrim, in the municipality of Sintra, Portugal. The castle stands on the top of a hill in the Sintra Mountains above the town of Sintra, and on a clear day it can be easily seen from Lisbon and much of its metropolitan area. It is a national monument and constitutes one of the major expressions of 19th-century Romanticism in the world. The palace is a UNESCO World Heritage Site and one of the Seven Wonders of Portugal. It is also used for state occasions by the President of the Portuguese Republic and other government officials;