This page will explain what exactly is the Labyrinth, and what Christian Groups that are mistakenly promoting it.
http://www.lighthousetrailsresearch.com/labyrinth.htm
 
It looks like there is also a LABYRINTH meditation experience at St. Stephen’s Episcopal Church in Philadelphia, Pa. in the Episcopal Diocese of Pennsylvania so the one at Emmanuel Episcopal Church in Fullerton, Ca. is not the only one.
http://www.diopa.org/diopa/ArticleDisplay.Aspx?ArticleID=201