I have a note here, can’t quite recall the whole idea:

Petite, a smaller version of Paris, founded on a planet after geography scans showed a strikingly similar placement.

Because it is smaller, some places are “missing” and a group used knowledge of those places to create dimensional gates.

I think I was fusing one of Rob’s campaigns (somewhere in and a recent POTY candidate:

Caspar Merian, Paris wie solche Ao. 1620 im wessen gestanden, 1655 - David Rumsey