You never see them being put up, they’re just there.

 In NCI News

Cranes!

It always boggled me how these things are built.
So, here it is:
Built from the ground up using smaller machines, counter weights, all that.

One would think its a reverse Jenga kinda deal.
Depending on the size it can take anywhere from a day to 3 days.

The structure idea dates way back to 515 BC

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