Viking feasting hall identified by ground penetrating radar

A Viking feasting hall measuring almost 50 metres in length has been identified near Vadstena in Sweden. Archaeologists from Stockholm University and Umeå University used ground-penetrating radar, a non-invasive geophysical method, to locate and map the house foundation. http://www.pasthorizonspr.com/index.php/archives/12/2014/viking-feasting-hall-identified-by-ground-penetrating-radar