Here's a badly filmed subway tour of the IND Culver Line
The quality of the video kind of sucks (it was filmed in 2015), but the facts are still pretty interesting.
X-ray street and underground maps of the layouts of NYC Subway stations
How cool are these x-ray subway station maps made by Candy Chan? They are sort of an off-shoot of Candy’s initial Subway station layout project which draws in detail the different levels of certain major stations in the MTA NYC transit system.