The following information is from BRIDGES TO OUR DREAMS, VOLUME ONE. Jack discusses a dimensional time travel gap that after my own research, appears to be inside the present-day Fourviere Basilica in Lyon, France.
"There are activation points on the earth that are dimensional holes. Through these holes man can travel through time. One of the holes is in Southern France and the Templars found this. Look to Lyon, France, and the hills there. There is a church on the highest hill. There is a dimensional gap there. We wish to tell man where this is, in order for man to travel to the future, NOT THE PAST. These are future-traveling dimensional gaps. There are past-traveling dimensional gaps as well, but this is not in the interest of the creator to have many go back. It accomplishes nothing. In the future man will travel to the future and return with knowledge to help. The refraction of light is involved in this, the light spectrum is higher in these dimensional gaps."