According to Josephus (Book 1, Chapter 2, 68-71), the family of Seth, the third son of Adam, was noted for constructing a particularly long-lasting edifice or monument.
...Now this Seth...did leave children behind him who imitated his virtues.... They also were the inventors of that peculiar sort of wisdom which is concerned with the heavenly bodies, and their order. And that their inventions might not be lost before they were sufficiently known, upon Adam's prediction that the world was to be destroyed at one time by the force of fire, and at another time by the violence and quantity of water, they made two pillars; the one of brick, the other of stone: they inscribed their discoveries on them both, that in case the pillar of brick should be destroyed by the flood, the pillar of stone might remain, and exhibit those discoveries to mankind; and also inform them that there was another pillar of brick erected by them. Now this remains in the land of Siriad to this day.
Source: Flavius Josephus, Jewish Antiquities, trans. William Whiston, Wordsworth Editions, 2006.
What is known about the fate of and/or contents of this pillar of stone according to Judaism? For example, does it still exist? If it has since been destroyed, when was it destroyed and do any copies of the wisdom inscribed thereupon still exist? If the pillar never actually existed and Josephus was lying and/or mistaken on this point, that is, of course, an answer!
As suggested by @mevaqesh, I am looking for any Jewish sources that discuss the idea that the family of Seth constructed a monument of stone to preserve pre-Flood knowledge for the benefit of those living after the Flood. A source could be a commentary on Josephus, but could also be an independent source that discusses the concept or idea or even an older source that Josephus summarized in his book.
I am aware that this passage is sometimes cited by fringe archaeologists and fringe historians as evidence of their theories, but I am interested in how Judaism understands or has understood this.