What is a major cultural achievement of the classical Greek civilization?

A major cultural achievement of classical Greek civilization is the development of democracy, particularly in Athens, where citizens participated directly in decision-making processes. This period also saw significant advancements in philosophy, with thinkers like Socrates, Plato, and Aristotle laying the foundations for Western philosophical thought. Additionally, classical Greeks Excelled in the arts, producing enduring works in drama, sculpture, and architecture, exemplified by the construction of the Parthenon and the plays of playwrights such as Sophocles and Euripides.