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

There's probably a hidden wire around your city that you don't know about.

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Unbeknown to most, there are transparent wires that wrap around over 200 cities in North America — including Manhattan — to mark a religious boundary.

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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.

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