Habitat 67, Montreal, Canada
An experiment in pre-fabricated, modular housing, Habitat 67 was constructed for Expo 67, the 1967 world's fair. The building was originally conceived by Israeli–Canadian architect Moshe Safdie for a thesis project at McGill University.
Stacks of 354 concrete forms make up Habitat 67. It originally held 158 apartments with balconies and gardens. Today, many of these apartments have been combined to form larger units.
The design was revolutionary at the time, though Safdie's experiment in affordable urban housing ultimately failed: High construction costs caused prices for units to soar.