Porto also known as Oporto is the second major city located in Portugal. Porto is a busy industrial and commercial center. The city was established alongside the hills watching the Douro river estuary and its historical center was presented World Heritage status by UNESCO in 1996. The first place to start with is the Ribeira. Next escalate to the Sao Francisco church and the Stock Exchange palace close by where you can visit the most imposing Arab room in the country. The world famous Modern Art Museum at Serralves and the Casa da Musica concert halls live in the area recognized as Boavista. Return to the center of the city and visit Mercado do Bolho. Porto is a mysterious city that discloses its charm to the visitor through time.