[Rurudyne]

No ... but it does say any of the following things:

... that Cain built the first city, Enoch, east of Eden in the land of Nod. It was Cain who seems to have come up with the idea of religion, too (Abel described as "also" bringing his offerings).

... or, after the birth of Enosh, that men had begun calling on the Lord.

In either case, it wouldn't have been unreasonable for them to have built a structure and if you live a long time it might be easier to develop advanced skills.

As for the structure being buried ... filling a stone structure with packed earth is a good way to protect it from damage if you believe there's trouble coming.

[UCANSEE2]

As for the structure being buried ... filling a stone structure with packed earth is a good way to protect it from damage if you believe there's trouble coming.

One day, far in the future, archaeologists will find Jet aircraft that were buried in the desert by Saddam. Wonder what they will think?