Porto rewards a short visit if you stick to a tight, high-value list. The Dom Luís I Bridge offers sweeping views over the Douro and connects the two riverside districts, while the Ribeira quarter delivers the colorful, tangled streets that define the city at street level. Just uphill, Torre dos Clérigos and the ornate Palácio da Bolsa show off Porto's skyline and civic history in close proximity to each other. Add a stop at Taylor's Port Wine Cellars for the drink the city is named for, and you cover architecture, riverfront charm, and local flavor without wasting a single afternoon.