Formed and Finished Concrete

All over Mexico one sees beautiful examples of preformed concrete work. 

In this post I will concentrate on chimneys, skylights, and cooling vents. 

I have never watched how they make these but
 I am assuming they are indeed preformed and out of concrete.

 I will continue to study this in the future.

(Please Note: To see an updated version of this post go to
Concrete Chimneys, Skylights And Cooling Vents In Mexico.)

This is obviously a flue. Alamos,  Sonora

This roof shows a flue on the left and then a skylight next to it.

The other two would make good cooling towers 

if that is not indeed what they are. San Carlos, Sonora

These next two are in Alamos, Sonora.

A flue on the left but is the one on the right a vent?

Alamos, Sonora

San Carlos, Sonora