Perched on a hilltop overlooking the Douro River, the Porto Cathedral is one of the best-known monuments in Porto, Portugal’s second-largest city. Built in the 12th century, this Roman Catholic church has an eclectic architecture style that combines Romanesque and Gothic influences with later Baroque additions. The space inside the cathedral is artfully decorated with blue and white azulejo tiles, which showcase some scenes from the Bible. Tiles like these are found throughout Portuguese cities, on apartment buildings, churches, and public buildings.