I think that's what this is, anyway, based on the solution to a previous mystery.
Day 51
Another type of natural gas line regulator vent
February 19th, 2012
I'm walking every street in New York City.
This is the counterpoint to my walk across the US. Instead of seeing a million places for just a minute each, I'm going to spend a million minutes exploring just one place. By the time I finish walking every block of every street in all five boroughs, I'll have traveled more than 8,000 miles on foot — all within a single city. Details!
Email me at matt@imjustwalkin.com
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Maps: Progress | Photos
~9,954 miles walked
Your donations allow me to keep walking full-time. If you think what I'm doing is valuable and you'd like to offer some support, I would be very grateful. On the other hand, if you think I'm a worthless bum, feel free to email me and tell me to get a job, bozo. Both are excellent options!
In the vein of mailboxes and portals, it seems to me it’s well past time for a count of these, too, no? :-)