Abstract: The study, preservation and dissemination of the synagogues of Greece has been a 30-year project initiated by the author in 1993. It included a journey to cities throughout Greece, documenting synagogues—some in use, others abandoned or in ruins—engaging in surveys and interviews. The project focused on people, architecture, the urban context and local history. Over the years, the work evolved to give a form and a voice to invisible buildings and places once vibrant with Jewish life. Through digital tools, books, exhibitions and in-situ journeys, the author aims to make this invisible architectural and historic evidence visible again, and accessible to a wider audience. This chapter addresses the question “How lost synagogues become visible again?” The author unfolds a methodology that combines low and high tech, and examples of restoration and dissemination projects, spanning three-decades until today. The survey and study of the synagogues of Greece that began between 1993 and 1999 is still in progress. Architectural restorations were completed between 2016 and 2023, while numerous exhibitions, presentations and publications has made his work accessible to a wider audience since 1997.