Not sure how I missed this, but holy crap! These amazing buildings were supposedly constructed by hand in survival on what I've heard is the oldest anarchy server (2b2t.org). You can imagine nothing lasts long on those, but the city's location remained secret for some time. There was a well-known item dupe trick being used to gather the materials, but all the blocks were placed legitimately. That alone is a massive undertaking on any server, let alone one where it could all be gone in moments.