Surprise at the summit cross, I would probably call it a hill cross. In the little box on the cross is the "Gipfelbuch", in which everyone can write their names. …
There are many cycling / hiking trails that lead to the Westerberg. Once at the top, you have beautiful views in all directions. Highly recommended for cyclists and walkers.
On the Trillenberg, at 142 meters the highest mountain in the Ankumerhöhe, you hike through a pleasantly green forest. In between you can keep looking through the trees at the surrounding fields.