Les Quartiers Modernes Frugès in Pessac is one of the best architecture detours from Bordeaux: an experimental 1920s housing estate designed by Le Corbusier. The coloured facades, terraces, and geometric forms show modernism being tested as everyday housing rather than as a museum object.
It sits outside central Bordeaux, so plan it deliberately rather than expecting to stumble across it. Architecture travellers should make the effort; casual visitors can pair it with a wider Pessac or suburban wine-country outing.