1 cave, 1 gem & mineral ground on the free Club 49 adventure map
What the map holds here
Sint-PietersbergCave Not a natural cave but a labyrinth: for centuries people quarried marl (soft limestone) out of the hill at Maastricht, leaving over twenty thousand passages under the Dutch-Belgian border, walls covered in charcoal drawings and... Open it on the map
Winterswijk quarryGem & mineral ground The Netherlands is almost entirely sediment and sea, so its one classic collecting site matters: the Winterswijk limestone quarry near the German border exposes 245-million-year-old Triassic tidal flats and yields marine reptile... Open it on the map
Every one of these is sourced
Each entry links to the record it came from. Access rules, permits and land status vary by country and are noted where the source states them, check locally before you go.
