<div id="ooyalaplayer" style="width: 800px; height: 450px;"></div><div style="display:none;" id="kalturavideoplaceholder">kalturavideoplaceholder</div><div><div><script src="https://apis.google.com/js/platform.js"></script><div class="g-ytsubscribe" data-channel="BusinessInsider" data-layout="full" data-count="default"></div></div></div><p class="embed-spacer"></p><p>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 <a href="http://nypost.com/2015/05/24/high-wire-strewn-through-city-lets-jews-keep-the-faith/" target="_blank">"secret operation"</a> to check and repair the wire in time for the weekend. We tagged along to see what it's all about.&#xa0;</p><p><em>Produced by <a href="http://www.businessinsider.com/author/jenner-deal" target="_blank">Jenner Deal</a></em></p><p><strong>Follow BI Video:</strong> <a href="https://www.facebook.com/BusinessInsider.Video" target="_blank">On Facebook</a></p>

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

kalturavideoplaceholderUnbeknownst 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.&#xa0;Produced by Jenner DealFollow BI Video: On Facebook

kalturavideoplaceholderUnbeknownst 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.

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

Jenner Deal

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