The Underground Mysteries: 76th Street

For students of the history of New York City and its subways, abandoned stations and half-built shells offer up an alluring reminder of what was and what could have been. Scattered throughout the city are various platforms now shuttered and lost to the era of longer trains, and of course, the provisions that remind us of the grand plans for the IND Second System capture the imagination. We know of the <a href="http://secondavenuesagas.com/2010/11/02/the-history-of-a-subway-shell-at-south-4th-street/">shell at South 4th Street</a> and a similarly hidden one at Utica Ave. But what of the other subway mysteries?