Biggest Viking show in 30 years aims at new appraisal revealing Nordic seafarers as traders – and, latterly, museum visitors
Hadrian’s villa tunnels explored as cavers drop down into hidden city
Amateur cavers map network of passages built by Roman emperor at Tivoli to keep slaves, oxen and victuals below stairs
Moles dig up buried treasure where human trowels are banned
English Heritage keeps a careful watch as volunteers sift through hundreds of molehills on a fortress site near the Roman wall
Home-made memorial risks damage to Hadrian’s Wall
National Trust appeals for people to get in touch and discuss ideas, after DIY plaque leaves resin on the 2000-year-old stones