[allendoerfer]

Except when some monarch built one for fun.

Like Mannheim [0]. Can't get more gridded than that.

[0]: https://encrypted.google.com/maps/place/Mannheim,+Deutschlan...

[twic]

Meanwhile, in Karlsruhe:

https://www.google.co.uk/maps/place/Karlsruhe,+Germany/@49.0...