pfalzgrafenstein castle on island on rhine river with castle gutenfels, kaub town, rhine valley hills and vineyards in

kaub pfalzgrafenstein castle rhine island gutenfels town hill vineyard rhinelandpalatinate germany travel nature landscape mountain river tourism romantic medieval fortification fortress gorge ancient valley german landmark cruise ruin rheingau heritage historic scenery picturesque attraction famous fortresses rhein riverbank shore riverside water hesse tower countryside burg mountains destination