In 1909, on the initiative of Matthias Thul from Beilingen and the teacher Nikolaus Bonnertz, a replica of the Lourdes Grotto was built near Beilingen.
An annual candlelight procession takes place to the grotto at the beginning of October. The path leads past the Chapel of the Cross in Speicher and from the Lourdes Grotto to Herforst and back through the Speicher forest.