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.
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.
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