This is a 10,000-year rabbit hole!
The Waste Isolation Pilot Plant (WIPP) was designed to store radioactive waste in Nevada. The storage area would not be safe to enter until 10,000 years had passed. Several groups of smart people came together to design warning messages that could outlive our civilization and protect future explorers. These designers knew they couldn't rely on any current language surviving that long, so they worked on landscape designs that project "this is toxic waste, don't mess!" ( audio/text background and four fanfics )
One of the forbidding-landscape proposals is incorporated into California, a meh dystopian novel published by a non-genre writer in 2014. If the WIPP project follows up on the experts' suggestions, elements of those proposal should be showing up in pop culture for millennia.