On the way back from La Ferté we visited a German World War I graveyard.
More than 30.000 soldiers have been buried there...

Next we stopped at a tunnel that is still in use to tow ships through a hill.
The tower is a ship that electrically pulls itself using a chain in the canal.

Finally we stopped in Le Quesnoy, a fortified city.
While the walls are being restored, a lot of the water around is changed into a parc.