One of the world’s most precious architectural gems rests on the banks of the Fox River in northern Illinois. Maybe you’ve seen the Edith Farnsworth House in Plano: It’s a mid-century glass and steel marvel designed and constructed by Ludwig Mies van der Rohe. The Under Rocks team got a chance to visit and learn more about the woman who commissioned her glass get-away in the woods, Edith Farnsworth.