A thousand years after the Vikings braved the icy seas from Greenland to the New World in search of timber and plunder, satellite technology has found intriguing evidence of a long-elusive prize in archaeology — a second Norse settlement in North America, further south than ever known.

The new Canadian site, with telltale signs of iron-working, was discovered last summer after infrared images from 400 miles in space showed possible man-made shapes under discolored vegetation. The site is on the southwest coast of Newfoundland, about 300 miles south of L’Anse aux Meadows, the first and so far only confirmed Viking settlement in North America, discovered in 1960.

Since then, archaeologists, following up clues in the histories known as the sagas, have been hunting for the holy grail of other Viking, or Norse, landmarks in the Americas that would have existed 500 years before Columbus, to no avail.