2 Best Sights in Baixa and Ribeira, Porto

Originally constructed in the 12th century by the parents of Dom Afonso Henriques (Portugal's first king), Porto's granite cathedral has been rebuilt twice: first in the late 13th century and again in the 18th century, when the architect of the Torre dos Clérigos, Nicolau Nasoni, was among those commissioned to work on its expansion. Despite the renovations, it remains a fortress-like structure—an uncompromising testament to medieval wealth and power. Notice a low relief on the northern tower, depicting a 14th-century vessel and symbolizing the city's nautical vocation. Size is the only exceptional thing about the interior; when you enter the two-story 14th-century cloisters, however, the building comes to life. Decorated with gleaming azulejos, a staircase added by Nasoni leads to the second level and into a richly furnished chapter house, from which there are fine views through narrow windows. Nasoni also redesigned the Paço Episcopal (Bishops' Palace) behind the cathedral, adding a famed monumental stairwell.

Designed by Italian architect Nicolau Nasoni and begun in 1754, the baroque tower of the Igreja dos Clérigos is the tallest in Porto and a landmark on the city's horizon. There are 225 steep stone steps to the belfry, and the considerable effort required to climb them is rewarded by stunning views of the red-roofed Old Town and the mouth of the Douro River. Binoculars and audio tours are available for an extra charge. The church itself, also built by Nasoni, predates the tower and is an elaborate example of Italianate Baroque architecture. Admission includes access to a small museum.