Habitat 67 is a housing complex on the Saint Lawrence River in Montreal. Designed by Israeli-Canadian architect Moshe Safdie, it originated in his master's thesis in architecture school, and was built for the 1967 Canadian World's Fair called Expo 67. Safdie's design opened up the traditional high-rise apartment building to allow natural light into all four sides of a dwelling and gave each unit an outdoor garden area, almost like a single-family house in the sky. (Photo: James Brittain)