While Porto's history can be traced back to Roman times, it was during the Middle Ages that the city developed into an important trading location, particularly for it's role in exporting the Douro Valley wine produce. This is still in evidence with the large warehouses that are located on the riverfront at Vila Nova de Gaia. Exploring Porto on foot can be tiring, as the city is built into the hillside and cliff face. However, this does afford superb views for those willing to make the climb. The city center, with its UNESCO status, is undoubtedly beautiful and exploring the riverfront down by the Douro river reveals excellent bars and restaurants among the historic wine cellars. Onhotels.com offers an unmatched selection of Porto hotels at great online rates. Our list of Recommended properties is an ideal starting point to book the best of Porto's hotel accommodation.