Blacksmiths forge a tool for making nails at Guédelon, a medieval castle in France that's unusual in many respects—particularly that it's under construction now. One smith says, “I love to try to re-create some old techniques that we don’t see anymore by studying old objects. And I’m paid to do it!” Read about this pioneering project in experimental archaeology in our September/October cover story. archaeology.org/issues/september-october-2025/features/how-to-build-a-medieval-castle/ | Archaeolo