Voynich is encrypted ENOCH

[Oscroft]

This is a nice parallel, but note the crucial absence of a spire or other roof structure. The whole idea of the Tower of Babel was that it could not be finished because God confused people's languages and scattered them across the earth.

And as the purpose of the Tower of Babel was to reach up to and enter the heavens, they surely wouldn't want a spire or roof structure, would they? On the other hand, there have been thousands of tall buildings over the centuries with spiral ascent structures (including internal ones).

So my first thought if I saw a medieval illustration of a finished tower with a roof - especially one shown not reaching the heavens - would be a long way from Babel.