True - but they can be found sometimes in the oddest of places so you never know. Also - rather than actually walking a labyrinth there are finger labyrinths that can be made from wood or clay (or even made in the sand) or a paper labyrinth where the image is drawn and you use your finger to trace around and around the pattern.

There's one that can be printed out HERE and HERE is one with a bit of history on labyrinths and how to make one from polymer clay and HERE is another that gives step-by-step instructions on how to draw one.