In the forests of Burgundy in central France, there's a bold effort underway to build a medieval castle, as they would have in an era before electricity, using ancient tools and laying stones by hand. Correspondent Seth Doane visits Guédelon, a project that…

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Searching, searching, always searching
grasping, gasping, neverlasting
toward the unknown edge, always lurching
age, death and rebirth, always passing

There's an end to the madness, I'm sure
it's not to be…