Porto (Oporto) is Portugal's second city after the capital Lisbon. It's the most important city in the country's norte region. It is the city after which port wine is named, and it remains the most important source for that libation. The city dates to the Antiquity. Culturally it is at least as significant as Lisbon if not more so, and the entire core city is a UNESCO World Heritage site. In this stunning video, Sprintz gives us a bird's eye view at this city which is located in an estuary of the Douro River.