Just wanted to do a pipe organ, but ended up with (superficial and undetailed) modelling of a cathedral-style piazza. The stained glass window image is acquired from Wikipedia - photo by Eusebius (Guillaume Piolle)
Modelled with 2.79, rendered in 2.8 with Eevee.
This is still a W.I.P., as some extra tweaking is yet to be done with materials, etc.