When master craftsman George Nakashima looked at a piece of wood, he did not just see material to make furniture. "Dad listened to the spirit of the wood," said his daughter Mira Nakashima.

George Nakashima's furniture, which brought out the beauty of rough edges, knotholes, cracks, and other natural features of wood, is now prized as art and considered among the best examples of the American craft movement.

Since his death in 1990, Mira has carried on his legacy, creating furniture with a team of craftsmen at his studio in rural Pennsylvania. The studio complex itself is part of that legacy. But now the World Monuments Fund says it is at risk.