The gothic styled Palácio Nacional de Sintra is situated in the heart of Sintra and was the most lived in royal residence, being continual used from the 15th century up until the fall of the monarchy in 1910. This is the palace that king Afonso VI (1650s) was imprisoned during his later life, as he was deemed, by his brother, too unstable to rule the country. http://www.sintra-portugal.com/guides/sintra-things-to-see.html
Created in 1916 and deeply remodelled between 2001 and 2003, Grão Vasco Museum was established in the Três Escalões Palace, next to the Viseu Cathedral, where the old seminary used to be. http://www.centerofportugal.com/grao-vasco-museum/
Seen from far, the towers of the cathedral are a reference point for those visiting the city of Viseu.The current cathedral was built next to an ancient Swabian-Visigoth temple possibly dating back to the 10th century during which the city was the capital to a large territory between the Douro and Mondego rivers. http://www.centerofportugal.com/viseu-cathedral-se/
Consisting of nearly two kilometres of sand punctuated by jagged rock formations rising from the sea and backed by steep limestone cliffs, Praia da Rocha was one of the first places in the Algarve to be developed for tourism. http://www.algarve-tourist.com/portimao-portugal-algarve.html
A National Monument, the Palácio da Bolsa (Stock Exchange Palace) is the property and headquarters of the Commercial Association of Porto. It was designed by Joaquim da Costa Lima in a neoclassical style in 1842. http://www.visitporto.travel/visitar/paginas/viagem/DetalhesPOI.aspx?POI=1781