Tarragona Cathedral is the Roman Catholic church in Tarragona in Catalonia, Spain. This edifice is located on a site formerly occupied by a Roman temple dating back to the reign of Tiberius , a Visigothic cathedral, and a Moorish mosque. This cathedral was declared a national monument in 1905. A walk around this beautiful cathedral and the surrounding monasteries is a great way to use your spare time learning about the history and ruins of Tarragona. It has many stained glass windows and interesting artifacts.