Spotted this in Raw Vision - the magazine of Outsider Art and Art Brut, always a good read even if you just look at the fantastic pictures inside. It's a review about A.G.Rizzoli : Architect of Magnificent Visions, who drew imaginary buildings in his lifetime and never published them.
So it was never built and would be very costly to construct and maintain if anyone had the dollars to do so.
As ever click for a bigger picture.