Wikipedia
This hike takes you on a neat tour of the Saarbrücken heights, including the battlefield site of Spichern. Spichern is in France, so the hike also includes several other exciting things, such as Westwall Fortifications and monuments from both the French and Prussian forces in the battle.
Kleuske -
The Marksburg is the only medieval castle to have survived undamaged on the Rhine. Its shining white appearance and soaring white towers make it one of the most iconic images of the Rhine valley and one of its most historically immersive. This hike is about walking around the ridge of the surrounding valley to get the best views of the castle from a distance.
Justin Bunch | CityscapeTravel
One of Germany's truly hidden gems is the Nahe Valley and the dramatic gorge that the river carves through the landscape. The Rothenfels or the Red Cliffs is a sheer vertical massif that rises from the otherwise flat landscape of the Palatinate. This hike takes you to the two main sights, the beautiful Red Cliffs and the ruined Artillery Bastion on top of them.
Exactness
Lindenfels was once an important outpost of the Electoral Palatinate in the Odenwald. However, as the region declined in economic importance, so did the castle. Though it was not destroyed, the Electors had the fortifications scrapped and sold for building materials to fund projects elsewhere. This hike takes you through some of the beautiful Odenwald landscapes up to the ruins of the Lindenfels castle, and back to the start.
Justin Bunch | CityscapeTravel
This combines the first two stages of the Malerweg, or the Painters' Way, through the forests of Saxon-Switzerland. The highlight is, without doubt, the fortress-like bridge of the Bastei and the dramatic views of the Elbe Valley below. The hike also includes some spectacular scenery up in the forests near Hohnstein.