One of my favorite memories from ten years ago was taking a pilgrimage to a part of Berlin that was called the Bitcoin Kiez: a region in Kreuzberg where there were around a dozen shops within a few hundred meters of each other that were all accepting Bitcoin for payments. The centerpiece of this community was Room 77, a restaurant and bar run by Joerg Platzer. In addition to simply accepting Bitcoin, it also served as a community center, and all kinds of open source developers, political activists of various affiliations, and other characters would frequently come by.