Porrentruy
Castle Esplanade (3)

Remedial work on the retaining wall of the esplanade led to the discovery of 120 stoneballs dating from the Middle Ages. These limestone balls were ammunition for trebuchet-type catapults, used between the 12th and 15th centuries, but they were discovered in an embankment built between the mid-18th and early 19th centuries... No one knows how and why they have survived the centuries!

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