Well, in Germany they are building a €20 million mosque (with sky dome) for up to 2,000 worshippers:
H/t reader U.B.
The building is set to host up to 1,000 worshippers
A massive new £17 million mosque in Cambridge is taking shape – with the golden dome now up.
This picture shows how the construction of the building – which had been estimated to cost £15 million – moves on apace and is set to open next year.
The construction of the mosque in Mill Road started on September 5 last year (2016) and is expected to be completed by November 2019.
The second phase of the construction of Europe’s first eco-mosque is now taking place and is now at the halfway mark.
The building is set to host up to 1,000 worshippers with 700 men in the main hall and a smaller section for 300 women.
H/t reader kevin a.