Schönbrunn Palace in Vienna, Austria was once the summer residence of the imperial family. I am sure you heard of Marie Antionette! You can roam the grounds and amongst other things venture into her room which is among the 1,441 rooms of this infamously extravagant palace! The gardens are jaw-droppingly beautiful, extending to 1.2km wide and 1km in length. No wonder it is one of the UNESCO list of World Heritage Sites! Fun Fact: Schönbrunn means beautiful spring.
The gardens are free to enter, however if you want to go into the palace, you have to pay € 11,50. If you purchase the Sisi Ticket, then you get entrance into the Schönbrunn Palace, Imperial Furniture Collection and Hofburg Wien for € 25,50. The Hofburg Wien includes the Imperial Apartments, Sisi Museum and the Imperial Silver Collection, so I think the Sisi Ticket is definteily worth the extra cost.
If you want fresh, authentic strudel on the Schloß Schönbrunn grounds, go to the Court Bakery which is a vaulted cellar beneath the Café Restaurant Residenz. You can watch a Strudel Show, where pastry chefs make authentic Viennese apple strudel. Afterwards, you can even sample a piece. If you do not want to watch the show, you can just go and purchase yourself a lovely warm piece of strudel. I did and it was delicious!
I did not realize how enormous the grounds were so unfortunately, I did not have enough time to explore all of the palace and gardens but now I have an excuse to go back! If you decide to go, plan to stay the full day so you get to explore everything.