Chángchéng shì Zhōngguó zuì biāozhìxìng de jiànzhù.
The Great Wall is China's most iconic building.
Tips
grammar
标志性 is formed from 标志 (symbol/sign) + 性 (nature/-ness). The 性 suffix turns nouns into adjectives meaning 'having the nature of': 标志 (landmark) → 标志性 (iconic).
