Once an apartment complex during Hungarian Communist rule, this 179-room hotel is now one of the Four Seasons’ grandest properties. The luxury brand gave new life to the 1906 Art Nouveau structure with a $125 million restoration, and ever since, the hotel lobby has wowed visitors with its stained-glass windows, mosaic tiles, and custom-made crystal chandelier. Opt for a Danube-facing room, and plan your visit during summer to check out the nearby Festival of Folk Arts at Buda Castle.