Links to More Information on Labyrinths:

Labyrinth Locator

The Labyrinth: Walking Your Spiritual Journey

Labyrinthos - Labyrinth Resource Center

The Sacred Labyrinth Walk

The Worldwide Labyrinth Movement

The Labyrinth Company

Mid-Atlantic Geomancy

PAXworks

There are a few other labyrinths in Maine which do not have websites but are listed on the Labyrinth Locator.  Just type ME in the "State abbreviation" field and click "Search".