It was once the tallest structure in Paris, until the modern Tour Montparnasse was built. I like the Eiffel Tower for it's looks - it's unique, it's engineering and construction, the views from the different levels, and the fact that it's such a grand icon of Paris, in fact the main icon, something that everyone recognises and associates with Paris.
BTW: The Eiffel Tower is NOT one of the Seven Wonders of the World. The seven wonders relate to ancient structures, and the Eiffel Tower is not quite that old! There have been some unofficial website wanting to select the seven wonders of the modern world but, as I said, these are unofficial and have never been recognised by historians.