narrow and dark medieval courtyard in the schweizerhof aisle of the hofburg palace in vienna, the former imperial castle residence

aisle architecture austria austrian baroque building capital castle center central city cityscape classical court courtyard culture dark destination dynasty europe evening exterior facade former habsburg heritage hidden historic historical hofburg imperial inner landmark medieval monarchy monument mysterious mystery narrow night palace part picture place principal residence royal rulers schweizerhof secret serves sightseeing small swiss taken today travel vienna wien