Subject to debate, but according to this article in the BBC, the claim of the “most valuable document in the history of the World Wide Web” belongs to a legal document that made the web publicly available in such a way that no one could claim ownership of it and that would ensure it was a free and open standard for everyone to use.
A team at the European Organisation for Nuclear Research (Cern) has launched a project to re-create the first web page.
The aim is to preserve the original hardware and software associated with the birth of the web.