The Pena National Palaceis a Romanticist palace inSintra, Portugal, built byFerdinand II of Portugal on the site of a ruined monastery. The palace stands on the top of a hill in the Sintra Mountains, and on a clear day it can be easily seen from Lisbon and much of its metropolitan area. It is a national monument,UNESCO World Heritage Site, and considered one of the Seven Wonders of Portugal. It is also used for state occasions by thePresident of the Portuguese Republic and other government officials.