Blue tiles (Azulejos) on exterior of Chapel of Santa Catarina (Chapel of Souls), UNESCO World Heritage Site, Porto, Norte, Portugal, Europe

porto azulejos blue tiles tile art unesco site cultural heritage architecture southern europe tourist attraction historical site european heritage stunning design religious architecture intricate patterns local craftsmanship tourism travel destination beautiful tiles landmark sightseeing history art cultural significance preservation traditional art decoration monument craftsmanship unique architecture vibrant colors religious site heritage site cultural tourism heritage preservation stunning visuals tourist destination beautiful architecture porto attractions iconic sites heritage buildings portugal intricate designs travel religious art artistry portuguese tiles exploration european cities spirituality mediterranean