Classified as a national monument, nobody is quite sure what this unusual 12th century building was for! Built in a Romanesque style the building forms an irregular pentagon with a subterranean vaulted cistern https://www.travel-in-portugal.com/attractions/domus-municipalis.htm

The strangest sight of Faro, which is hidden away from the main tourist route, is the Capela Dos Ossos, the bone chapel. The bones of the overcrowded cemeteries were stored in the small chapel that is located within the Carmo church complex. These bones were incorporated into the designs of the chapel, with skulls lining the walls – very strange and creepy. http://www.algarve-tourist.com/Faro-portugal-guide.html

The pink Estoi Palace is the finest example of Rococo architecture found within the Algarve, while the carefully maintained grounds contain beautiful Azulejos tiles. http://www.algarve-tourist.com/Faro-portugal-guide.html

The bone chapel is the most ghoulish sight of Portugal and thus one of the most memorable monuments of Evora. Inside the small chapel, the walls are lined with bones of the long-deceased, exhumed from the city's graves as the city expanded to allow further burials. http://www.evora-portugal.com/Guides/Evora-sights-attractions-sightseeing-things-to-see.html

The Jerónimos Monastery was proclaimed a UNESCO World Heritage Site in 1983. This notable 16th century work of architecture became part of Portuguese identity and culture. https://www.visitlisboa.com/see-do/sightseeing-activities/museums-monuments/mosteiro-dos-jeronimos