Museum for the Macedonian Struggle, Thessaloniki, Greece - GREAT online archive of 1,328 digital photographs (many of people) and postcards. You can also take a virtual tour of the museum with details of exhibits.
"The Research Centre for Macedonian History and Documentation (KEMIT) maintains a specialised library and electronic databases, collects and processes archival material, publishes monographs and studies, organises seminars and conferences, provides information and documentation to interested parties and in general promotes the academic objectives of the Foundation through all possible means.
"The fundamental priority of the Museum is to serve visitors and researchers. The library and archives are open to the public every day, but archival research requires a permit, as does the copying of photographic or documentary material. Archival material may also be subject to further restrictions, depending on the specific unit."
When visiting local museums or libraries, contact them first to determine current hours of operation and any restrictions on research, or permissions/permits you might need before arriving.
Museum of the Macedonian Struggle
Proxenou Koromila 23, 54622
As usual, good luck with your Greek family history research.
Georgia Keilman nee Stryker (Stratigakos)