For architecture lovers in Paris who like hidden places:
Rue Mallet-Stevens, 75016 Paris: The whole dead-end street consists of a group of cubist villas, all of them constructed by Robert Mallet-Stevens in the 1920s. They are as young and fresh as ever, now protected by the shadow of a hundred year old trees. A beautiful and quiet place in the big city.
Metro line 9 Ranelagh or Jasmin