[seanhunter]

A very interesting example of this is the eruv in Golder's Green in North London[1] which is a thin wire which apparently converts outside areas into a private space, allowing observant orthodox Jews to do things on the Sabbath they would not otherwise do. There are proposals for a couple more of these in North London.

As someone who is not religious at all I find it fascinating.

[1] https://www.thejc.com/news/community/new-golders-green-eruv-...

[kelnos]

There's also an eruv that contains nearly all of Manhattan: http://eruv.nyc/

I personally think this has entered the realm of absurdity, but there's admittedly a certain charm to it.

[umanwizard]

These are very common in places with a lot of Jews (e.g. the U.S. and Israel).