The Blue Mosque and other similar construction have made use of domes/ arches spanning in different directions creating a huge space below for the congregation of worshipers.
This is quite unlike the churches in Europe where cathedrals usually adopted narrow and steep arches limiting the space below.
The Blue mosque thus show multiple circles on the roof which are really awesome.
In the first picture, I have attempted to give it a blue tone – so in my imagination, it is literally a blue mosques.
I have also uploaded the original picture for comparison.