1. Schönbrunn Palace - Explore the stunning former imperial summer residence, its gardens, and the Gloriette.

2. St. Stephen's Cathedral (Stephansdom) - Admire the impressive architecture and climb the South Tower for panoramic views of the city.

3. Hofburg Imperial Palace - Discover the former principal imperial palace of the Habsburg dynasty.

4. Vienna State Opera - Experience a world-class opera or ballet performance in this historic venue.

5. Kunsthistorisches Museum - Immerse yourself in art and culture at this magnificent museum.

Based on your request to enjoy Christmas in Vienna, here's a detailed itinerary for a magical holiday experience:

Day 1:
- Morning: Arrive in Vienna and check into your accommodation.
- Afternoon: Visit the famous Belvedere Palace and Gardens for a photo opportunity in the winter wonderland.
- Evening: Explore the Art Advent on Karlsplatz and indulge in the festive atmosphere of this traditional Christmas market.

Day 2:
- Morning: Start the day with a visit to St. Stephen's Cathedral and enjoy the breathtaking views from the South Tower.
- Afternoon: Experience the Winter Market on Riesenradplatz, where you can go ice skating and immerse yourself in the holiday cheer.
- Evening: Attend a classical concert at St. Stephen's Cathedral for a memorable musical performance.

Day 3:
- Morning: Discover the enchanting Old Viennese Christmas Market at Freyung and shop for unique gifts and souvenirs.
- Afternoon: Savor the seasonal treats at Demel Bakery, known for its exquisite pastries and delightful Christmas specialties.
- Evening: Take a leisurely walk through the city to admire the beautiful Christmas lights and decorations.

Day 4:
- Morning: Visit the Hofburg Palace and explore the imperial history and grandeur of this iconic landmark.
- Afternoon: Enjoy a relaxing time at the Am Hof Christmas Market, sipping on Weihnachtspunsch and sampling delicious festive treats.
- Evening: Step inside the Vienna State Opera for a captivating evening performance.

Day 5:
- Morning: Take a guided tour of Mozarthaus and learn about the life and music of Wolfgang Amadeus Mozart.
- Afternoon: Visit the Giant Christmas Bow at Stephansplatz and capture the holiday spirit in a unique setting.
- Evening: Relax and unwind with a festive drink at one of Vienna's cozy cafes or bars.

This itinerary is designed to provide a perfect balance of cultural exploration, festive activities, and culinary delights, ensuring a memorable Christmas experience in Vienna.