The Clérigos Tower is indisputably Porto’s most iconic landmark. Built during the first half of the seventeenth century by Italian Nicolau Nasoni (check out more of his work around the place), the tower is the most important Baroque building. Brace yourself and climb its 240 steps. You will not regret it when you reach the top. If you think Porto’s street-level views are spectacular, you have not seen anything yet.