Amateur archaeologists found a mysterious 12-sided object from the Roman Empire that experts can't explain

• An amateur archaeology group found a mysterious dodecahedron near an ancient Roman villa.
• The purpose of these 12-sided objects is unknown, though many theories have been suggested.
• The complex crafting process suggests they were likely custom-made and expensive.

Down a tree-lined road 100 miles north of London lies an open field where a Roman villa once stood about 2,000 to 1,700 years ago.