The ERC funded project Hidden Galleries concerns the role of religious minorities in the transformation of Central and Eastern Europe societies in the 20th century seen through the prism of the secret police archives in the region. The secret police archives, in addition to containing millions of files on individuals and organisations monitored by the state, also constitute a hidden repository of religious art, publications, photographs and the ephemera of religious life. The project re-examines and re-contextualises the holdings of secret police archives in three countries; Romania, the Republic of Moldova and Hungary, with the aim drawing scholarly and public attention to alternative uses and meanings of the archives in relation to the study of minority religions. The project website, as well as presenting the activities and publications of the project team, hosts a Digital Database with sample materials held in various secret police archival repositories. The website will also host an Online Exhibition of the project’s findings.