What is this project trying to do?
Historical accounts of unusual experience - visions, apparitions, journeys, voices, lights, encounters - are abundant and almost impossible to test. The witnesses are gone, the conditions were never written down, and centuries of interpretation have settled on top of each account. This project collects such reports source-critically and keeps what each source actually says separate from what was later said about it.
It also pays attention to the physical things that outlive the witnesses: the churches, caves, shrines, statues, instruments and clocks associated with recurring stories. The narrow question is whether a surviving physical environment can help examine an old report more carefully than the report alone allows.
We expect the answer, in most cases, to be no. The archive of reports, the registry of objects and the source collection would all be worth having even then, which is the main argument for building them first.