Introduction to the Clérigos Tower: Torre dos Clérigos is an absolute landmark building in the center of Porto. It can be seen from all angles of the old city. It is also the first ancient building that attracts the attention of tourists when they come to this city. . This tower was built in 1763. It is 76 meters high, has 6 floors and 240 steps. The top of the tower can overlook the center of Porto 360 degrees.