Porto is Portugal’s second largest city and the capital of the Northern region
Porto is a busy industrial and commercial center. The city itself isn't very populous (about 250,000 inhabitants), but the Porto metropolitan area (Greater Porto) has some 1,500,000 inhabitants in a 50 km radius, with cities like Gaia, Matosinhos, Maia, and Gondomar.
The city was built along the hills overlooking the Douro river estuary, and its historical center was awarded World Heritage status by UNESCO in 1996. It has been continuously inhabited since at least the 4th Century, when the Romans referred to it as Portus Calle
Porto has a semi-Mediterranean climate, although it's strongly affected by the Atlantic ocean, which makes it cooler than other cities with this climate. However, temperatures can rise as high as 40ºC in August during occasional heat waves. Winters are mild and humid, with occasional cold nights where temperatures can drop below 0ºC.