The Foundation for Jewish Heritage https://www.foundationforjewishheritage.com/ has posted a map Historic Synagogues of Europe http://historicsynagogueseurope.org/synagogue-map. 

By clicking on any of the red  “balloons”  a photograph and information about that synagogue opens up. 

The Foundation for Jewish Heritage is dedicated exclusively to the preservation of Jewish architectural sites, working internationally to ensure a future for historic synagogues, Jewish monuments and places of cultural significance.

If you click on their news tab, https://www.foundationforjewishheritage.com/news-hub.html there is information on the former Merthyr Tydfil synagogue in Wales (see below); coverage of their Iraq Syria Jewish heritage mapping project; mapping of the endangered Jewish heritage of Iraq and Syria; the project to save the historic and remarkable 'Soldiers Synagogue' in Tomsk in Siberia; supporting local efforts to save the remains of the New Israelite Temple in Hamburg; Moreshet in Wroclaw and more.

The most recent is their securing funding for preserving an re-purposing the former Merthyr Tydfil synagogue in Wales  see: https://www.foundationforjewishheritage.com/news-merthyr2.html

Jan Meisels Allen

Chairperson, IAJGS Public Records Access Monitoring Committee