former marl quarry in the pietersberg near maastricht which is converted into a leisure area for hiking, cycling and natural fresh

1926 accessible area autumn background bats beach beautiful blue caves cement closed coast converted cycling desert dirt dry dune enci established factory fall former fresh hiking hole horizon landscape leisure maastricht marl marlstone natural nature natuurmonumenten november ocean old outdoor outside park people pietersberg pool protected public quarry remainings rock sand sandy scenic sea sky stone summer swimming tourism transformation travel underground view water which