Rising splendidly above the gardens and commanding sweeping views of Vienna’s skyline, the Oberes Belvedere, at Schloss Belvedere, is one of Vienna’s unmissable sights. Built between 1717 and 1723, its peerless art collection, showcased in rooms replete with marble, frescoes and stucco, attests to the unfathomable wealth and cultured tastes of the Habsburg Empire.