Eiffel Tower, tower in Paris, France, an early example of wrought-iron construction on a gigantic scale. Today the Eiffel Tower is considered one of the world’s most recognizable landmarks.

The tower was designed and built by the French civil engineer Alexandre-Gustave Eiffel for the Paris World's Fair of 1889, a celebration of the centennial of the French Revolution. Constructed in a little more than two years, the tower is 324 m (1,063 ft) high, including a flagpole at the top. At the time it was completed the tower was the tallest structure in the world.

The lower section of the tower consists of four immense arched legs set on masonry piers. The legs curve inward until they unite in a single tapered tower. There are three main platforms, each with an observation deck. The first deck is 57 m (187 ft) high, while the second is 116 m (381 ft) off the ground. Both are accessible by stairs or elevator. The third deck, which is 276 m (906 ft) high, is accessible to visitors only by elevator.