Is the Eiffel Tower a building? The issue came up at trivia the other night - "Which building did the Empire State overtake to become the world's tallest?" After clarifying the question with a very pointed "Do you mean building or structure?" we went with the Chrysler Building. We were marked wrong. I haven't since been able to find anything definitive, but quizmaster Leon said the Eiffel Tower was right because a lobster is an animal.