Earlier quoted context omitted.
> they'll be carved and stored deep underground. But of course you need some marker then on the ground so people know where to look for it later if they want to read the data. Maybe some artwork? A giant monolith perhaps?
A giant pyramid, they can last thousands of years even in our aggressive environment, much more in the weak Martian weather.
Perhaps at the D&M pyramid?
https://www.jpl.nasa.gov/images/pia04745-the-cydonia-dm-pyra...