The mysterious man-made caves in Belgium burrow thousands of feet into the soft rock south of Brussels. Said to have been carved out in during the Neolithic, all sorts of people have frequented the caves, from fleeing refugees to cunning criminals.
The grottoes of Folx-les-Caves are located in the municipality of Orp-Jauche in the province of Walloon Brabant. In the distant past, the grottoes were used as mines. One of the rocks found there was tuff, a type of soft volcanic rock which is rich in calcium carbonate. These were mined for use by farmers as fertilizer. Later on, the harder limestone found deeper in the caves were mined for local building projects.
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