SUBURBIM participated in the annual Assembly of the International Fortress Council in Karlovac and Slavonski Brod (Croatia), in October 2011. These towns arose from Renaissance and Baroque star-shaped bastion Fortresses, like Petrovaradin Fortress in Serbia. National Association for Fortifications from Zagreb organized the Meeting. SUBURBIM became a member of IFC, also a part of the network which deals with Fortresses - bastions along the former Military border on the Sava and the Danube rivers, to Transilvania in Romania.