Swiss Drought Discoveries Redraw Roman Maps of History

A very hot and dry summer made some buried Roman buildings easier to see.

Plants growing above the ruins dried out faster than plants elsewhere.

These dried patterns are called parch marks.

Archaeologists used a drone to photograph fields near the ancient city of Aventicum.

The pictures showed baths, houses, roads and possibly a temple.

The team used the new evidence to improve maps of the Roman city.

Some marks disappeared after fields were mowed or temperatures cooled.

The archaeologists may dig in selected places later, but they do not want droughts to continue.