Grayling Labyrinth GRAYLING, MI (Interlochen Public Radio) - An ancient form of walking meditation is being rediscovered in North America. Labyrinths date back 4,000 years. Their design is found in most major religions and many different cultures. In the last decade, hundreds of labyrinths have been built in churches, hospitals and parks. Bob Allen visited the labyrinth at Mercy Hospital in Grayling. © Copyright 2010, Interlochen Public Radio