Ancient espionage structures in Rome; search narrows for Viking settlement in Canada; Nubian necropolis; world’s oldest message-in-a-bottle
Military barracks deep below Rome may have housed Hadrian’s secret service
Sagas and site data help narrow down search for a second Viking settlement in North America
Ancient Nubian necropolis shows importance of women in its early kingdoms
World’s oldest message in a bottle found in Australia, 130 years later