Street there are 20 blocks to a mile when going North/South, so 3 miles on a north/south avenue in Manhattan above 14th. Street is 60 blocks.
One mile = 20 blocks = 5280 feet. Therefore 2 blocks = 528 feet.
In short, then, “staring into the abyss” means to deeply contemplate something foreign to yourself, and which may have consequences on your concept of your own self.
Heading is defined as the direction a person or thing is moving. An example of a heading is a car driving south. The definition of a heading is the title or subject of an article or another piece of written work. An example of a heading is a few words telling the subject of an article.