Just off Spyglass Drive in Tehachapi, Calif., a small city about a hundred miles north of Los Angeles, a hulking steel lattice rises in the middle of a dusty landscape. The girders hold up one end of a suspended wooden road that swoops up the hillside underneath it like a smooth, caramel-colored roller coaster. The other end lies some 500 feet away, its top nine stories above its lowest dip.
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