How big cranes are installed in the middle of nothing?

Question

I mean, yesterday I was walking in the city when I saw a huge crane installed in a field without other buildings or construction near of it. That thing was higher than anything around.

I still can’t understand how they are build. Please help.

In: Engineering

Answer 1

They are like a train that builds their own track, one length at a time as they move up in the sky.