An Unexpected Walk on the West Side in New York City

A few days ago I was supposed to be going on a group walk in New Jersey which was starting from the George Washington Bus Station at 178th Street at 10.00 am. However, despite setting off from home early enough, the combination of subway cancellations due to track work and mistakenly getting on a local train rather than an express meant I was only at 125th Street at the due time. Knowing the group would probably have left by the time I did get there I decided it was rather pointless continuing to head north, but I'd been looking forward to a long walk, so on a whim I decided I would walk back to Grand Central Station (42nd Street) and explore an area of the city which is relatively unknown to me.