Architecture is the art and science of designing buildings and other spaces to be occupied or used by people-science, because architects have to understand the physical characteristics of the building materials they include in their designs, as well as the physics of the structural designs themselves; and art, because architects typically try to utilize aesthetic principles at the same time as they're trying to meet human needs via their designs. Indeed, some of the most prominent cultural landmarks in the world-the Duomo in Florence, the Taj Mahal in India, the Empire State Building in New York-first found their form in the minds of architects.