Nico Ditch
Nico Ditch is a six-mile long linear earthwork between Ashton-under-Lyne and Stretford in Greater Manchester. It was dug as a defensive fortification, or possibly a boundary marker, between the 5th and 11th century. Legend has it Nico Ditch was completed in a single night by the inhabitants of Manchester, as a protection against Viking invaders in 869–870.