Millennium Mileposts | National Cycle Network - Sustrans.org.ukFind out more about these cast-iron artworks and use our interactive map to discover one on a National Cycle Network route near you.millennium milepost millennium mileposts national cycle network posts national cycle network markers cycle mileposts cycle network markers mileposts on ncn ncn mileposts https://www.sustrans.org.uk/national-cycle-network/millennium-mileposts/