This discussion has been reminding me of my first encounter with Calderdale, at the age of 17. Slowly pedalling up the A646 on a bike with a mechanical problem as it got dark on a late September evening, and having to walk the bike most of the way up the lane to Mankinholes Youth Hostel. I got the bike fixed in Todmorden the next day, and headed off: up one of the vertical lanes that goes up to the Long Causeway.
I was using a 1/4-inch-to-a-mile road map with no indication of topography. "Ignorance is the mother of adventure."