The Clérigos Church was considered as one of the biggest architectural projects in Porto during the 18th Century. A wonderful example of baroque architecture, it was built by Nicolau Nasoni, a renowned Italian architect and painter. Nasoni was Italian by birth, but he adopted Porto as his second home. His tomb can be found in the interior of the church. One of the main highlights of this church is the altarpiece of the chapel which was executed by Manuel dos Santos Porto and is made of polychrome marbles. A monumental tower, Torre dos Clerigos, which was built between 1754 and 1763, stands behind the church and is also a prominent landmark. It offers panoramic views of the surrounding area and is a favorite among tourists. While the entrance to the cathedral is free, visiting the tower requires a ticket.