The Eiffel Tower is one of the most iconic structures in the world and is a symbol of France. Its popularity can be attributed to several factors. Firstly, it's a unique and innovative design that was considered a marvel of engineering at the time of its construction. Secondly, its sheer size and height make it an impressive sight, especially when viewed from a distance. Thirdly, its location in Paris, one of the most romantic cities in the world, adds to its appeal.

The tower has also played a significant role in history. It was built for the 1889 World's Fair, and at the time, it was the tallest structure in the world. It was intended to showcase French engineering and technological prowess. It has since become a symbol of Paris and France and is one of the most visited landmarks in the world.

Furthermore, the tower has been featured in countless films, books, and works of art, further cementing its iconic status. Its silhouette has become instantly recognizable and has become a cultural icon.

In conclusion, the Eiffel Tower is iconic because of its unique and innovative design, impressive size, historical significance, and its cultural significance in popular media. It's a true masterpiece of engineering and a must-see for anyone visiting Paris..