This single tower, WP 1/39, belongs to a stretch of the Upper German-Raetian Limes that runs close to Rengsdorf and Melsbach, on a gently rolling shoulder of the Westerwald. Unlike many of its neighbours it has been marked and reconstructed in a way that lets you see how it might have looked, with a timber tower over a stone base, and a cleared line of sight in each direction. The towers were usually just a few metres square, with a lookout floor on top and a ladder you could pull up. A handful of soldiers at most would have lived in one, which gives you a sense of scale: it was a sentry post, not a castle.
The country around it is farmland with patches of beech and spruce. Rengsdorf is a small town of the Westerwald with a spa tradition and a pleasant centre, and Melsbach and Anhausen are villages that give a sense of local life. The roads here are quiet and well surfaced, often with views that open suddenly over the Wied valley and the Neuwied basin. The Wied river itself has cut a pretty, winding valley with little mills, and the stretch downstream toward the Rhine is a good ride, with bends and shade.
For fuel and a proper meal, Neuwied is the answer, only six kilometres away, down a long descent to the Rhine. Neuwied has a good promenade and a flood wall painted with local history, and it also has the Roman fort at Niederbieber, which was one of the largest on the frontier, and the museum at Rheinbrohl, where the Limes began. If you want a short Roman circuit, the Limes visitor centre at Rheinbrohl makes a good start or finish.
The tower is easy to stop at, since it sits near a road with a small parking area, and the walk to it is short. It is worth looking at the view from the platform if it is open, because the reason for the site is the view. Mornings are best, with fresh light and quiet.