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> Empire City Subway
This obscure tunnel is hidden in plain sight – and still better, open to the public. Anyone who has gotten off the subway at 47-50 St-Rockefeller Center is familiar with the large concourse that surrounds the subway station, offering access to various stores and the basement of Rockefeller Center, where one can buy tickets for Top of the Rock.
A far lesser known portion of this concourse can be found hidden behind a door that simply looks like it leads into another generic office building. At the far northwest corner of the subway concourse, you will find a set of revolving doors labeled “1271 6th Avenue.” Entering these doors is in actually like entering a whole other subterranean world. You are greeted by the cleanest, brightest underground space in midtown. A long hallway ducks into building basements and works all the way up to 1285 6th Avenue (between 51st and 52nd streets), and as far west as the breezeway behind 777 7th avenue.
Using all of the combined concourse tunnels, it is possible to walk underground from as far north as 52nd Street to as far south as 47th Street, and as far west as just short of 7th Avenue to as far east as 600 5th Avenue. An Untapped Cities reader, thepete tells us that it used to connect Rockefeller Center to Grand Central Terminal too.