Sliding roofs.

Except to light Sliding Roofs (such as polycarbonate based) There is the potential for heavy metal sliding roofs
Perfect for theaters, cinemas, stadiums and entertainment venues. The cost of such construction is increased, but not exorbitant.

Photos of project in Roda Corfu premises luxury 5 star hotel.
The metal roof, weighing 7 tons, opens and closes with just the touch of a switch.