Ioannis Fountoulis' testimonies and research on the Ayvalık Holy Spring (Panagia Phaneromeni), previously published only in Greek, are now published in English with up-to-date information. Coming from a Greek family from Ayvalık, Ioannis Fountoulis, thanks to his family ties and his theological career, presents a comprehensive study of this extraordinary structure, which is of utmost importance for understanding the cultural heritage of the city and spiritual therapy in general.