castle pfalzgrafenstein and castle gutenfels, kaub, germany

castle pfalzgrafenstein gutenfels kaub germany fortress fort citadel bastion defensive hill burg architecture architectural style tower towers mount river building landmark tourism tourist attraction sightseeing sight sights travel journey tour trip landscape nature historic historical exterior town city unesco world heritage site pfalzgrfenstein pfalz toll island falkenau middle ages rhine rhineland rhineculture rhineromance rhinelandpalatinate german europe shpulak