Porto is a coastal city in the northwest of Portugal known for its imposing bridges and the production of Port wine. In the medieval district of Ribeira, on the banks of the river, narrow cobbled streets pass through the houses and restaurants of the merchants. The São Francisco Church is known for its exuberant Baroque interior with ornate golden sculptures. The sumptuous 19th century Palácio da Bolsa was a stock market and was built to impress potential European investors.