Arco Idaho’s claim to fame is being the first town lit entirely by nuclear power. You might think it ran on a nuclear plant for decades, but no. It was about an hour in 1955. Today the town is losing population and looks especially tired after the summer season ends. Still, its WPA-built basalt buildings are impressive, the high school graduating class numbers on the hill will soon wrap 100 years, and the burgers and shakes at Pickle’s Place are delish.