austrian national library and the hofburg congress center on heldenplatz in hofburg. vienna

architecture attraction austria austrian building burg capital castle center city classical complex congress cupola dome dynasty eagle elites emperor empire europe european facade famous ferdinand franz gold habsburg heldenplatz historic historical history hofburg holiday imperial innere josef landmark library marble monarch monarchy monument museum national nobility ornate palace renaissance residences roof royal royalty sculpture sculptures sights sightseeing stadt statue symbol triumph trophy vacation victory vienna white wien