Classical architecture originated in ancient Greece and Rome and is known for its emphasis on symmetry, proportion and harmony. The Parthenon is one of the most famous and exemplary works of classical architecture. Built in the 5th century BC on the Acropolis in Athens, it has columns with precise dimensions and architectural refinements to create optical corrections and balance. Marcus Vitruvius wrote De Architectura, which outlined key principles of classical design such as durability, utility and beauty. His work influenced architecture for centuries.