Enter the Hofburg imperial complex through the domed archway, and make your way onto the enclosed square. 
Here you’ll meet the last ruler of the 1000-year-old Holy Roman Empire, trace the growth and expansion of the palace complex as it hosted nearly seven centuries of Habsburg rulers, see the chapel where the renowned Vienna Boys Choir performs, hear about the mysterious artifacts of the Imperial Treasury (and learn why Hitler was so keen to get his hands on them), get to know the enigmatic Empress Elisabeth, and see where the renowned Lipizzaners of the Spanish Riding School perform (as well as getting the scoop on hassle-free tickets). 
A map of the entire route can be found at the following link: https://tinyurl.com/zxjv65n6