La Chaux-de-Fonds is the historic heart of Swiss clock-making. It's also the former home of Le Corbusier and Louis Chevrolet (yes, that Chevrolet), but those are stories for other times. La Chaux-de-Fonds is not a handsome town, but you quickly see why watch-making thrived here in the 18th and 19th centuries.
After a fire destroyed most of the town in 1794, the streets were laid out east-west on the hill that rises south to north. Even in winter, at this elevation of 1000 meters, the sun streams in the south-facing windows. This was perfect lighting for the individual watch-making workshops that sprang up here after the fire.
The clock-making museum is a wonder of science and art married.