An original 1884 planning sketch.
Work in progress, 1888.
The Tower is finished for the 1889 Exposition.
Ground-level at the Tower, 1889.
Another look through the base of the Tower, 1889.
The Eiffel Tower was the centre of the 1900 Exposition as well.
Struck by lightning, 1902.
The official website for the Eiffel Tower can be found here. While there, and with a few hundred dollars to spare, you can even enjoy dinner in the Tower at Le Jules Verne restaurant.