Faro Cathedral in Faro, Portugal, is a historic Roman Catholic cathedral dating back to the 13th century. Visitors can explore its striking Gothic, Baroque, and Portuguese Plain Style architecture, climb the bell tower for panoramic views, and admire the unique bone altar. Notably, the cathedral was once a mosque during Moorish rule, later consecrated as a Christian church, and today stands as a National Monument of Portugal, housing an 18th-century organ and centuries of layered history.