Here's a half serious answer: do not design it as a static object that can withstand the erosion. Design it as a dynamic process that can change itself and adapt to the environment.
Establish some kind of religion or cult or fraternity. Give them your personal webpage as a sacred document that can be passed down with some secret ritual. Develop a community of the admirers.
One example: a shrine in Japan kept the records of ice ridge forming in a certain lake (which they considered sacred). The tradition started around 15c and still continues today. It's one of the oldest climate record at a specific location.
Establish some kind of religion or cult or fraternity. Give them your personal webpage as a sacred document that can be passed down with some secret ritual. Develop a community of the admirers.
One example: a shrine in Japan kept the records of ice ridge forming in a certain lake (which they considered sacred). The tradition started around 15c and still continues today. It's one of the oldest climate record at a specific location.