the Wikipedia entry notes (citing a press release): "The architects were inspired by Roman amphitheatres."

Well, duh:

Meanwhile, it's always helpful to remember that if the Tower of Babel actually existed, no one has the remotest idea what it actually looked like. Which is why there are a gajillion different artists' renditions of the Tower of Babel. God only knows why Beck chose the version depicted by Flemish renaissance painter Pieter Bruegel.

I'm willing to wager that Rabbi Lapin's "source" for his information that designers intended the EU Parliament to look like the Tower of Babel is never made public. But then, this is a guy who already has quite a history of wingnuttery. There's a reason, after all, that David Duke loves to quote Lapin.