Found it, https://www.ianvisits.co.uk/blog/2015/07/12/3d-maps-of-every...

As comment in https://news.ycombinator.com/item?id=1496485.

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Another page showing a lot of stations done in this way was shared before on HN. I remember they were like art, not misstanding any wall in your house. Can't find the HN post anymore. Maybe somebody else remembers.

I can only find http://stations.aeracode.org/ still with the search which shows the stations in an interactive 3D map showing tubes and pathways.

Found some more: https://www.ianvisits.co.uk/blog/2015/07/12/3d-maps-of-every...

http://www.projectsubwaynyc.com/x-ray-area-maps/

http://weburbanist.com/2015/09/26/wayfinding-in-subways-3d-b...

But still not the original HN article.