Begin your day by visiting the MuseumsQuartier, a cultural complex that houses several museums and art galleries. Then, head to the Hundertwasserhaus, a colorful and unique apartment building designed by artist Friedensreich Hundertwasser. After lunch, visit the Belvedere Palace, which houses an impressive collection of Austrian art, including works by Gustav Klimt. End your day by taking a stroll through the Naschmarkt, Vienna's largest outdoor market.