In Preventing a word from being spoken, I asked about how to prevent a word from being spoken, and the means I chose was to change humanity so that humans can no longer say the Word.
To that end, I am proposing a great magical ritual, the building of the Tower of Babel. The nature of the ritual is that the tower is built, and when it is complete, it is deliberately collapsed, and in its breaking, breaks the people apart, making them unable to understand each other, and also unable to say the forbidden Word.
My question is a problem of engineering. I want the people in my story to build as high a tower as possible, using materials that were available circa 3000 BC, or could be made during that period by people of the day using modern circa 2000AD knowledge, though without significant modern infrastructure. The tower must be stable, able to remain standing during and after construction given the weather and geological conditions in an area like Mesopotamia.
However, the tower must also be constructed so that it can be collapsed on demand, with a minimum of effort, and preferably without explosives. A method that would allow a single person triggering the collapse to be able to retreat to a safe distance before the structure collapses would be preferable. It would also be preferable if the mechanism by which the tower could be collapsed was not immediately obvious to those constructing the tower.
While descriptions of the biblical tower of Babel exist, they need not be considered to represent constraints on the design of the tower in this question.
Given these constraints, how high a tower might be constructed, from what might it be constructed, and how could it be collapsed on demand?