Keystone, South Dakota, has gone through a number of transitions. It started, like all things, as nothing. Then in 1875, gold was discovered and settlers came pouring in to work the mines. Soon enough this small settlement grew into the town of Keystone. Then tin and other metals were found in the ground, drawing more population. Fanatical mining depleted the metals, and when there was nothing left to take out of the ground, the economy crumbled and the town nearly collapsed. Then came the carving at Mount Rushmore, reliably passable roads, a railroad and electric power. Keystone boomed again, this time with tourism as its main industry. Or with a nod to our diner friend, let’s call it visitorism.