There's a hidden wire stretched above American cities -- and very few people know what it's actually for

Unbeknownst to most, there are transparent wires that wrap around over 200 cities in North America to mark a religious boundary, including Manhattan. And every week, there is a “secret operation” to check and repair the wire in time for the weekend. We tagged along to see what it’s all about. 

Produced by Jenner Deal

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