The Széchenyi Chain Bridge was the first structure across the Danube in Hungary, built in the mid-1800s and, as a suspension bridge, a marvel of architecture and engineering at the time. Now one of seven bridges across the river, it was the first to connect Buda (West) and Pest (East), shifting the flows and development of the city. Lion sculptures guard its entries, it's lit up at night to dazzling effect, and of course it offers stunning views of the literally blue Danube.