Find other labyrinths all round the world at Worldwide Labyrinth Locator (a collaboration between Veriditas and The Labyrinth Society):  http://wwll.veriditas.labyrinthsociety.org/

Veriditas, The Worldwide Labyrinth Project: www.veriditas.net (this is the organisation we trained with)

Walking a Sacred Path (Veriditas labyrinth workshops in Chartres): http://www.veriditas.net/programs/chartres.html

The Labyrinth Society (USA): www.labyrinthsociety.org

Instructions on how to draw a classical 7 circuit labyrinth:
http://www.labyrinthsociety.org/what/makinem.html  
http://www.lessons4living.com/drawing.html

Instructions on how to draw the Chartres labyrinth:
http://www.labyrinthsociety.org/what/tape-cp1.html