Right at Nadrazi Holesovice station (metro, bus and tram - there are no more options) at Holesovice. There used to be a driver's school. Don't know if it is still here. But I think there's a pub (or bar or club) here now. They are growing these sculptures for years... very successfully. And I lied in the title. This is not the Weirdest Industrial Sculptures Place in Prague now. There's a street exhibition at Andel (also a bus, metro and tram station). There are sculptures made of old computers and various home appliances. They are over 3 metres high and from what I remember they are in the shapes of prehistoric animals. I should go there again and take a picture of them so you can compare which place is weirder. Hope they will not be gone on weekend.
PS: I took this shot over a curved tram window, thus the blur in some places.