>>13523155I know Valkenburg, it's an old limestone mining town in Limburg (Netherlands) that grew out of its britches when business was good.
The area's littered with caves from that mining operation, most of them very stable.
People have made paintings and charcoal drawings on the wall and etched their names and timestamps into the walls as well. Some of those are 500 years old.
Nobody's ever had a wrestling match in a limestone mine before.
