Porto, Portugal is famous for its delicious port wine, beautiful buildings and breathtaking views. The city is less polished than its rival Lisbon, but block for block, it may be even more full of gritty, Old World charm. Houses with red-tiled roofs tumble down the hills to the riverbank, prickly church towers dot the skyline, mosaic-patterned stones line streets, and flat-bottomed boats ply the Douro river.