vienna, austria. equestrian monument of archduke charles ( erzherzog karl) on heldenplatz ( heroes square)

archduke architecture attraction austria austrian baroque blue building capital castle charles city cityscape culture decoration equestrian erzherzog europe european evening exterior famous hall heldenplatz heroes historic history karl landmark market monument night old palace panoramic park sightseeing sky square street tourism tourist touristic town traditional travel urban vacation vienna view wien winter x28 x29