After leaving Wetzlar, you’ll soon reach the village of Orbiel, where you can take an interesting detour to the Fortuna Mine. It is the only iron ore mine in Germany where visitors can see a demonstration of underground work with the original machinery. The town of Weilburg, located in a bend of the river, has nearly survived the centuries unscathed, with its beautiful castle. The market square, featuring the Neptune Fountain and the adjacent bourgeois houses, is a stunning example of Baroque architecture.