Final answer:
The Ionic column is attributed to classical Greece, showcasing their detailed and harmonious architectural innovations like the Erechtheion and the Parthenon's frieze.
Step-by-step explanation:
The architectural innovation attributed to classical Greece is the Ionic column. Classical Greece is renowned for its development and refinement of architectural orders, particularly the Doric, Ionic, and Corinthian orders. Of these, the Ionic order is distinguished by its slender columns and scroll-like volutes on the capital, showcasing the Greeks' intricate attention to detail and proportion in design.
Notable examples of Greek architecture featuring the Ionic order include the Erechtheion on the Athenian Acropolis, which also displays female figure caryatids as supporting columns for its porch. Moreover, the Parthenon, while primarily Doric, incorporates an Ionic frieze, illustrating the level of sophistication and harmony within Greek architectural innovation.