Getting to the site was an adventure.  Although the LONELY PLANET Guide to the Yucatan, 3rd Edition,  (2006), ISBN 1-74059-992-6, page 226, makes it sound simple, the towns and roads lack clear signs and directions.  Furthermore, the locals prefer to call their town Vicente Guerrero instead of Iturbide, so asking directions gets a little interesting as well.  Ah well, it is all part of the journey.

I am including a couple of photos of the entrance to help identify when you get there.