Macrochasm is a survival anarchy Minecraft server that has been operational since 2016. It's map has not changed since then, and will not change. The server was started in indev as a single player world, pasted onto an infdev world, and then loaded in alpha. It has chunks from (just about) every single generation update since Minecraft's conception.
You can dig through the ruins and find fruits of other people's hard work lost to the test of time, be the one whose ruins will be found two, three, four, five or more years from now, or be the one who will turn those builds into ruins. It's up to you.