With such roads and such carriages on the land, and such pretty steamboats as they have upon the water, it would be very pleasant going up through the highlands of the Rhine, if there were nothing but the natural scenery to attract the eye of the traveller. But besides the quaint and ancient villages, and the curious old churches which adorn them,--villages which sometimes line the margin of the water, and sometimes cling to the slopes of the hills, or nestle in the higher valleys,--there are other still stronger attractions, in the castles, towers, and palaces, which are seen scattered every where on the river banks, adorning every prominent and commanding position along the shores, and crowning, in many cases, the summits of the hills. Many of these castles and towers, though built originally hundreds of years ago, are still kept in repair and inhabited, some being used as the summer residences of princes, or of private men of fortune, and others, being armed with cannon and garrisoned with soldiers, are held as strongholds by the kings, or dukes, or electors, in whose dominions they lie. There are a great many of them, however, that have been allowed to go to decay; and the ruins of these still stand, presenting to the eye of the traveller who gazes up to them from the deck of the steamer, or from his seat in his carriage, or who climbs up to visit them more closely, by means of the zigzag paths which lead to them, very interesting relics and memorials of ancient times. The ruins are generally on very lofty summits, and they usually occupy the most commanding positions, so that the view from them up and down the river is almost always very grand. The castles were built by the dukes, and barons, and other feudal chieftains of the middle ages, and they are placed in these commanding positions in order that the chieftains who lived in them might watch the river, and the roads leading along the banks of it, and come down with a troop of their followers to exact what they called tribute, but what those who had to pay it called plunder, from the merchants or travellers whom they saw from the windows of their watchtowers, passing up and down.