Your Eiffel Tower tickets get you access to a number of levels. The structure is composed of three levels; the first floor, second floor, and the summit (top level).
On the first floor, you'll find the museum exhibits, a glass floor that's perfect for photos of the street below, ever-changing exhibitions, a plethora of souvenirs, and restaurants. The second floor boasts even more eateries, an array of shops, and an observation area.
Many people don't know that there is also a secret military bunker underneath the Eiffel Tower's south pillar, or that when Gustave Eiffel designed the Eiffel Tower, he also included a private apartment at the top.