On the feast of Pentecost, May 25, 1917, a three-meter-high Celtic cross was erected to commemorate the Irish who had died in the camp.
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Dietkirchen is situated at the eastern end of this widening, with the valley becoming narrow again near Runkel.
It is regarded as the oldest galleried church on the Rhine and was the model for the churches of the so-called Lahn Group, which included the parish churches of Moselweiß and Güls (both villages are now boroughs of Koblenz), Ems, Dietkirchen, and Morsbach in the Siegerland.