fragment of the fortress wall with a bay window on the f`astronomical` bastion. kaliningradacade. reduit of the

anybody architecture astronomical attraction bastion bay blue brick century city construction day defensive deserted eastern facade fastronomical former fortification fortress fragment historical kaliningrad kaliningradacade koenigsberg landscape military nineteenth nobody observatory old prussia red reduit reduite russia semicircular sky sternwarte style sunny urban view wall window winter xix