Conferences worldwide focus on a range of disciplines relating to the construction of the built environment. They tend to emphasize either the art or the science of building, the former focusing on architectural theory and design while the latter targets a range of topics from civil and/or building engineering to building physics. Vitruvius’s De Architectura Libri Decem is a seminal treatise more than two millennia old which addresses these themes in a holistic manner. This text remains valid today for students and professionals engaged in architecture and building engineering. Translated as Ten Books on Architecture, it not only presents an overall view of the disciplines of town planning, architecture and civil engineering, along with the qualifications required to practice them, but also addresses building materials, civil-engineering structures and the science influencing buildings. Although grounded in the practice and technology of Ancient Rome, the principles put forward in this treatise are still valid nowadays for effective, sustainable architectural-engineering design based on rigorous education and good knowledge of building materials and construction. Vitruvius’s definition of architecture—the one still customarily used—is an inclusive philosophical statement on the essence of building for humanity to house humanity. It recalls the symbiotic relation between architecture and building engineering that is often forgotten in the contemporary emphasis on specialization.