I just heard of the parallel roads of Glen Roy. Would you be surprised to learn they aren't roads? They are glacial lake shorelines. I kid you not.

The Parallel Roads of Glen Roy is one of three sites in Scotland included on a list of internationally important geological locations.

The site, which is part of NatureScot’s Glen Roy National Nature Reserve, is home to an iconic suite of glacial lake shorelines that informed the development of Glacial Theory in the 19th century. Three shorelines, or ‘parallel roads’, are evidence that glaciers were once in an area where none exist today.

https://www.nature.scot/parallel-roads-glen-roy-recognised-one-worlds-top-geology-sites

https://iugs-geoheritage.org/geoheritage_sites/the-parallel-roads-of-glen-roy/