The Romans cast their temples from it, Le Corbusier delighted in it, and Frank Lloyd Wright described its potential to be a ‘permanent, noble, beautiful’ building material. Concrete is hardly the most romantic of substances, yet its incredible properties have enabled the construction of ancient pagan temples, breathtaking Brazilian galleries and straw-filled Spanish hermitages. In celebration of our new Concrete book, we present some of the boldest buildings ever poured.