Contributor TravelPenguin created this awesome 4k drone video of the great Portuguese city of Porto. Porto is the country's second city (after Lisbon) and is the center of the main urban concentration of the northern part of the country. It sits on the estuary of the Douro River, a few km/mi inland from its mouth on the Atlantic Ocean. The video features footage of the Porto historical city center (which is a UNESCO World Heritage site), the famous Dom Luís I Bridge over the Douro River, and more. This video was a DVOW finalist in August, 2019.