Porto Cathedral, also known as Sé do Porto, is one of the oldest and most important landmarks in the city of Porto, Portugal. The cathedral is a Roman Catholic church and was built in the 12th century. It is located in the heart of the city's historic center, and its location on the top of a hill provides stunning views of the city and the Douro River.

The cathedral was built in a Romanesque style, but has been renovated and expanded over the centuries, giving it a mix of architectural styles, including Gothic and Baroque. The façade of the cathedral is impressive, with two tall towers and an ornate rose window. Inside, visitors can admire beautiful stained glass windows, an altarpiece in the Chapel of the Blessed Sacrament, and a magnificent silver altarpiece in the Chapel of the Holy Sacrament.

One of the most striking features of the cathedral is the cloister, which was added in the 14th century. The cloister is decorated with intricate carvings and arches, and provides a peaceful oasis in the heart of the city. The cloister also houses the cathedral's museum, which contains an impressive collection of religious art, including illuminated manuscripts, sculptures, and tapestries.