I was walking by Madison Square Park on Monday evening with OZ when he pointed to the MetLife building that sits on the North-East corner of Madison and 24th and told me a fascinating fact. At the time of its construction it was going to be NYC's tallest building, 100 stories. The onset of the great depression in 1929 forced the project to be cut back. What stands there now is the 32 story base.
Photo gallery and historical info on NYC Architecture.