Grace Cathedral is something like the home of the labyrinth in the USA. Lauren Artress discovered the old labyrinth in the cathedral of Chartres in France again and released with her book Walking A Sacred Path • • • Rediscovering the labyrinth as A Spiritual Tool a world-wide Renaissance of the labyrinth idea. She brought also the labyrinth into Grace Cathedral in San Francisco. In addition there is still an other one outdoor the cathedral.
On Google Earth you can see it very good.
Here is a map section, in which one can also navigate.