Came across an amusing anecdote in a collection of baseball stories (said to be true stories, pulled from various archives and news reports) first published in … imagine this … 1949. It seems that a man named Charles White proposed, back in 1912, of building a field on top of Grand Central Terminal in the heart of Manhattan:
A visionary named Charles White came forward with a scheme in 1912 which would solve one of the major problems confronting the owners of baseball clubs. The owners were often complaining in those days about their inability to construct adequate playing fields owing to the high cost of real estate. Mr. White told them to quit worrying.He submitted plans for a baseball field of immense proportions, sodded with bright green turf and containing all the other conveniences of an up-to-date ball field. This field, however, would be up in the air — built over the roof of the new Grand Central Station, extending from Lexington Avenue to Madison Avenue and from Forty-fourth to Fiftieth streets.