Datteln Lock

The Schachtschleuse was built in 1928 and put into operation in 1931 - a true piece of industrial culture.

The large lock Datteln was built in 1928 and opened in 1931 together with the canal. It has a length of 222 m, a width of 12 m, the drop height is 7.5 m and the water consumption per smuggling is 20,000 m³. Ships with a draft of up to 2.8 m can be sluiced. On the upstream and downstream side, this lock is closed by lift gates. These sluice gates were renewed in November 1993.
Source: Wikipedia

A lock, like so many others on the canal.
At least at first glance.
If you look closer, you notice a much larger difference in height compared to the other canal locks.
And then there is this node that the lock serves.

So definitely worth it.