Napa Valley, once known for its cattle and silver mines, has grown into an international wine destination. On the way, many buildings and institutions have vanished. From the Von Uhlit family's fruit farm in Napa to the Wheeler Ranch in St. Helena, fields and orchards became neighborhoods and vineyards. The Dolphin, a steamboat that once delivered travelers from San Francisco, was replaced by faster transport, and the Napa State Hospital's original...