The strange limestone hills around Kanne village in Limburg province have been quarried for building material since the middle ages. The mellow golden stone known locally as mergel has been used to build farms, houses and churches along the Meuse valley.
The Kanne quarry is no longer worked, leaving behind a network of underground caves used for mushroom cultivation and candlelit wedding receptions. There is even a cycle route through the caves developed by Limburg tourist office.
Derek Blyth’s hidden secret of the day: Derek Blyth is the author of the bestselling “The 500 Hidden Secrets of Belgium”. He picks out one of his favourite hidden secrets for The Brussels Times every day.