After spending several days in Lisbon, we ventured North to Porto. The second largest city in Portugal (after Lisbon), Porto is located on the shores of the Douro River and the Atlantic Ocean. It is one of the oldest European cities. The historical center was declared a UNESCO world heritage site in 1996. Like Lisbon, Porto is steeped in charm, history and art. Porto is also the capital of Port wine production and surrounded by the Douro River Valley which is home to internationally acclaimed Portugese vineyards. Port wine is produced primarily in the cellars of Villa Nova de Gaia area. Wandering the hilly, narrow streets or the cobblestone alleys where the port wineries are, experiencing the incredible restaurants and watching the port boats dotting the Douro creates an incredible atmosphere.