Photos

On my "Rheinsteig" walking-tour a saw this very nice castle in the Rhine river, the castle Pfalzgrafenstein.
According to Wikipedia:"Burg Pfalzgrafenstein is a toll castle on the Falkenau island, otherwise known as Pfalz Island in the Rhine river near Kaub, Germany. Known as "the Pfalz", this former stronghold is famous for its picturesque and unique setting.
Its keep, a pentagonal tower with its point upstream, was erected 1326 to 1327 by King Ludwig the Bavarian. In 1260 the Counts of Katzenelnbogen divided their county and selected their inhabitans of Kaub. In 1477 Pfalzgrafenstein was passed as deposit to the Counts of Katzenelnbogen again[1]. Around the tower, a defensive hexagonal wall was built between 1338 to 1340. Later additions were made in 1607 and 1755, consisting of corner turrets, the gun bastion pointing upstream, and the characteristic baroque tower cap.
The castle functioned as a toll-collecting station that was not to be ignored, as it worked in concert with Burg Gutenfels and the fortified town of Kaub on the right side of the river. A chain across the river forced ships to submit, and uncooperative traders could be kept in the dungeon until a ransom was delivered. The dungeon was a wooden float in the well.
Unlike the vast majority of Rhine castles, "the Pfalz" was never conquered or destroyed, withstanding not only wars, but also the natural onslaughts of ice and floods by the river. Its spartan quarters held about twenty men.
The island of the castle was used for the Rhine crossing by 60,000 Prussian troops under Blücher in the winter of 1814 in his pursuit of Napoleon.
"A ship of stone..."The castle was acquired by Prussia in 1866, and toll collections ceased in 1867. It continued to be used as a signal station for the river boat traffic for about another century. In 1946, the castle became property of the State of Rheinland–Pfalz.