West of Praça de Liberdade, follow Rua dos Clérigos to the Clérigos Tower, which the Italian architect Nicolau Nasoni designed in 1754. The tower's six floors rise to a height of some 76m (249 ft.), which makes it one of the tallest structures in the north of Portugal. You can climb 225 steps to the top of the belfry, where you'll be rewarded with one of the city's finest views, of Porto and the river Douro. The Italianate baroque Igreja dos Clérigos, at the same site, was also built by Nasoni and predates the tower.