The Eiffel Tower makes a compelling case for the world's most famous landmark—but "most famous" has no official metric.
Global recognition: Near-universal visual identification. Visitor volume: ~7 million/year (pre-COVID). Media presence: Default Paris/Francestanding. Cultural saturation: Logos, films, art, souvenirs, emojis. Architectural influence: Proved iron could be beautiful; inspired towers globally.
It was built as a temporary exhibit (1889), hated by artists, saved by radio, and became permanent by accident and utility. Its lattice transparency makes it visually light despite 10,100 tons. It's accessible (elevators, stairs) and illuminated nightly—a living landmark, not a ruin.
Is it #1? By recognition metrics, likely yes. But every culture has its own "Eiffel Tower"—a structure that says "you are here" in the deepest sense.