Long-hidden features of a Visigothic city uneathed in Spain

Archaeologists have detected long-hidden features of a Visigothic city in Spain, including unexplored parts of a palace and a building that may be one of the oldest mosques in Europe, Live Science reports.

Without digging, the researchers used a geomagnetic instrument to reveal walls and other structures still buried underground at Reccopolis, which is in a rural area outside of Madrid. They found that the 1,400-year-old city was far more extensive than the ruins visible at the site today would suggest.

"In every space that we were able to survey, we found buildings and streets and passages," study co-author Michael McCormick, a medieval historian and archaeologist at Harvard University, told the publication.