2 Best Sights in Baixa and Ribeira, Porto

With the most striking exterior of any church in Porto, Igreja de Santo Ildefonso has a facade covered with some 11,000 blue-and-white azulejo tiles depicting scenes from the Gospels and the life of Saint Ildefonso. The church was completed in the 18th century on the site of a previous chapel from the Middle Ages. Inside, a sacred art museum showcases interesting religious artifacts, books, and paintings, and you can see a gilded raised altarpiece by the 18th-century Italian artist Nicolau Nasoni.

During the last days of Porto's siege by the absolutist army (the miguelistas) in July 1842, there was gunfire by the nearby Convent of St. Francis. These shootings caused a fire that destroyed most parts of the convent, sparing only this church. Today the church is the most prominent Gothic monument in Porto. It's a rather undistinguished, late-14th-century building on the outside, but inside is an astounding interior: gilded carving—added in the mid-18th century—runs up the pillars, over the altar, and across the ceiling. An adjacent museum houses furnishings from the Franciscan convent. Guided tours include visits to the church, museum, and catacombs.