Maybe we should start erecting a structure on top of these sites that would be very hard to move. Perhaps we build it out of stone and carve warnings into the e

Maybe we should start erecting a structure on top of these sites that would be very hard to move. Perhaps we build it out of stone and carve warnings into the entrances. The most resilient structure is probably some kind of pile of large quarried rock but we need it to be recognizable so it should have a fundamental shape. I guess I'm describing a pyramid which made it about 4k years before we forgot what the symbols meant and went digging through them anyway. 4/100 ain't bad for a first try though! It takes a lot of resources (today) to dig down 1400' so that might be helpful. However, it's still doable with time and motivation for practically any human society. Space is another interesting idea with its own set of issues (eg: getting waste there safely) but has the advantage of requiring a space-fairing civilization which also requires advanced knowledge, cooperation and communication which gives a better chance that simple grave-robbers don't dig something up after the decline of our current knowledge, skillsets and civilization.