The Hofburg grew over six centuries into one connected complex. Each ruler added a wing instead of replacing what already stood, so a thirteenth-century core sits against Renaissance and Baroque wings and finally the Neue Burg, a vast curved block begun in the 1880s and finished in 1913. That block was designed as one half of a grand forum whose second half was never built. Altogether the Hofburg runs to eighteen wings and nineteen courtyards, and it is still in daily use: the Austrian president works here, and so do a library, a riding school and several museums.
Three sets of interiors are open to visitors. The imperial apartments hold the rooms where Franz Joseph slept on an iron camp bed and was woken at half past three each morning. The Sisi Museum spends most of its space taking apart the romantic legend of Empress Elisabeth rather than selling it. The treasury holds the crown of the Holy Roman Empire and a narwhal tusk that was catalogued for centuries as a unicorn's horn. Outside, the ground opens onto Heldenplatz, the square where the country's twentieth-century crowds assembled.