What are other attractions than Sisi Museum that are worth visiting in Vienna?

The other must-see attractions in Vienna are:<a href='/spanish-riding-school-l4623/'>Spanish Riding School</a><a href='/vienna-state-opera-l3941/'>Vienna State Opera</a><a href='/museum-der-illusionen-vienna-l130878/'>Museum der Illusionen, Vienna</a><a href='/albertina-l3946/'>Albertina</a><a href='/chocolate-museum-vienna-l121520/'>Chocolate Museum Vienna</a>

What are the most popular Sisi Museum tours and tickets?

The best Sisi Museum tours and tickets are:<a href='/vienna-l7/vienna-empress-sisi-walking-tour-imperial-apartments-t377306/'>Vienna: Empress Sisi Walking Tour & Imperial Apartments</a><a href='/vienna-l7/vienna-skip-the-line-hofburg-ticket-sisi-museum-tour-t388135/'>Vienna: Skip-the-Line Hofburg Ticket & Sisi Museum Tour</a><a href='/vienna-l7/vienna-hofburg-palace-sisi-museum-silver-collection-tour-t388126/'>Vienna: Hofburg Palace, Sisi Museum & Silver Collection Tour</a>