Salam. I just watched National Geographic documentary series, ‘Big, Bigger, Biggest‘ about the development of dome in the architecture world. I really enjoy the documentary where cool 3D visualization and animation helps me to understand the whole thing.
To date, the biggest structure with the dome concept in the world is the Oita Stadium in Japan. So, after I’m doing some comparison on Google Map, I guess if somebody wants to beat the record, perhaps Masjidil Haram can be the best place for the next biggest dome.
Here’s an illustration and visualisation to show how big the dome can be if it is possible.
Lot of research need to be done for this purpose. But for this mega project, and the most complicated job is to ensure the safety of the people underneath the dome. This is mainly because Muslim will be in Masjidil Haram 24/7 to perform prayers throughout the year!
Please note that this proposal has nothing to do with the Makkah expansion plan. It just another Sketchup and Photoshop work done by me.