If time allows:
We start by XIX century Ajuda palace, one of Europe's most perfect romantic buildings. Inside, there are luxurious rooms lined with silk, decorated with porcelain and glass and lit by crystal chandeliers, sculpture collection, paintings, furniture, tapestries, crystal chandeliers.
We then stop at Queluz, from the XVIII century, the Versailles-like palace. Used as the summer residence for royals, it is the country's finest example of Rococo architecture.
Sintra is dominated by the two conical chimneys of the Palácio Nacional da Vila, dating from the XIV century this is the oldest and the best preserved medieval Royal Palace in Portugal and also considered one of the best glazed tiles museums in the Peninsula.
Next is XIX century Pena Palace and its gardens. Pena palace is one of the major expressions of 19th century Romanticism in the world. The Palace has a profusion of styles much in accordance with the exotic taste of the Romanticism, including the Neo-Gothic, Neo- Manueline, Islamic, Neo-Renaissance and others.
The Mafra National Palace is a monumental Baroque and Italianized Neoclassical palace-monastery. This vast complex is among the most sumptuous Baroque buildings in Portugal and one of the biggest monuments constructed in Europe in the 18th century. Mafra complex encompasses a basilica, the royal majestic palace and a beautiful convent.