Situated at the point where the Duoro River meets the Atlantic Ocean in Northern Portugal, Porto has been a mercantile city since its earliest days as a Roman outpost. As one of Europe’s oldest cities, it boasts a wealth of cultural and historical attractions too, including a recently revamped medieval district bordering the scenic waterfront. Beautiful examples of baroque architecture are scattered around the old part of town as well. Walking tours offers a great way to explore the city, as most of the major tourist attractions in Porto are located close to each other. Porto’s most celebrated contribution to Portuguese culture is port wine, the nation’s top export. Visits to Porto typically include trips to the port wine caves located just across the river at Vila Nova de Gaia.