Buda Castle is a great place to begin your exploration of Budapest - not only is it one of the city's most impressive historical buildings, it offers some quite spectacular views of the River Danube below. Chain Bridge was the first bridge to connect Buda and Pest, and whatever direction you're going in, be sure to appreciate the fantastic silhouette cut by the city on both sides of the river. Among the city's other treasures is the Hungarian Parliament Building (the world's third largest), its many museums and galleries, St. Stephen's Basilica, and its wonderfully decorated squares.