Ignoring all the issues with decoding any message after 500 years... Semiconductor based devices will stop working by then due to diffusion. Maybe a large condu

Ignoring all the issues with decoding any message after 500 years... Semiconductor based devices will stop working by then due to diffusion. Maybe a large conductive structure that creates EM backscatter/interference that encodes your website? Or perhaps something that attracts lightning strikes and uses them to emit a burst of information. Also, if your website really does last and remains decodeable that long, and if it is an exceptional occurrence, then it could also become a target for destruction if the winds of culture shift in some way. See also: https://en.m.wikipedia.org/wiki/Long-time_nuclear_waste_warning_messages https://en.m.wikipedia.org/wiki/Long-time_nuclear_waste_warn...