Walking past a building in Bath, I spotted an old Ordnance Survey benchmark carved into the wall—a historical record of past surveying techniques still etched into the city’s landscape. A small but fascinating reminder of how we once measured and mapped the world around us. #HistoryHiddenInPlainSight #OrdnanceSurvey #MappingHistory #Benchmarks #LostLandmarks #UKHistory #Surveying #BathUK #HistoricalMarkers #ForgottenBritain #HiddenHistory #UrbanArchaeology | Imperidox