The current Ziegfeld Theatre was always a movie theatre and never housed shows.
There WAS a Ziegfeld Theatre very close to that same location, but on Sixth Avenue and 54th Street. It was a legit theatre that housed the original Show Boat, Gentlemen Prefer Blondes, Brigadoon, Kismet, among other shows. But its remote location was unpopular and it was demolished in 1966. From photos, it was an extraordinary looking building, inside and out.

Begin at the beginning and go on till you come to the end: then stop.
Updated On: 9/13/15 at 08:51 AM