There are definitely projects designed with the specific intent of doing that, e.g. https://longnow.org/clock/ https://longnow.org/clock/ But there are other t

There are definitely projects designed with the specific intent of doing that, e.g. https://longnow.org/clock/ https://longnow.org/clock/ But there are other things, including awesome-and-dangerous nuclear waste sites, with warning messages/symbols designed to last beyond the collapse of modern civilization https://en.wikipedia.org/wiki/Long-term_nuclear_waste_warning_messages https://en.wikipedia.org/wiki/Long-term_nuclear_waste_warnin...