Porto, Portugal's second largest city, is famous for its wine, historic architecture and magnificent waterfront. Stroll through the Ribeira district, a UNESCO World Heritage Site, and visit Porto's wine cellars to taste the famous port wine. The Dom Luis I Bridge and the Clerks' Tower are must-sees. Porto offers a combination of historic charm, vibrant culture and exceptional gastronomy, all in a picturesque setting on the banks of the Douro River.