Super Spoiler in regards to the game: Saboteur.

In Saboteur's final mission, you are to take the elevator up to the top of the Eiffel Tower and take revenge on the person who screwed up your life.

Which the whole concept of Saboteur is also revenge, where you have the choice of sneaking around or killing everyone.

Dishonored reminded me very much of the Splinter Cell games. Same "stealth is good" system, and kill/no kill choices.

So elevators and revenge make it the same ending?

I'd say thats a bit of a stretch...

"Final boss" battles or "revelation moments" often happen on top of a elevated structure, either in games or in movies.
That's because it gives the feeling that there is no way back, no escape, and that this [censored] ends right here and right now. Add a bit of rain and/or storm and lightning, you got the perfect cliché mood for the catharsis of the story.
On the top of my head I can think of the god of wars, Metal gear solid, final fantasy advent children, mirror's edge, Castlevania Lords of Shadow, Batman 1 ( Burton ), Ghostbusters 1, etc.

Sometimes it's even more interesting to throw a known monument in the mix, like Big Ben, Lady Liberty, the Eiffel Tower, or whatever you can think of. The moment is even more prestigious !

In the Saboteur's case, a game that takes place in Paris *had* to get an ending on top of the Eiffel tower : it's so obvious. Could have been on the roofs of Montmartre or in the highest tower of Notre-Dame, but the Eiffel Tower is much more of a modern icon. Notre-Dame will be left to medieval/gothic themed stories ( the Hunchback, etc ).
Dishonored is a game with a steampunk-inspired world, which is basically metal meets steam. Well, in Dishonored it's more "oilpunk", but the steel part stays true. The Eiffel Tower can be considered as a real-world incarnation of steampunk, since it's an architectural prowess entirely made of iron... What's more, it was made at the end of the 19th century, which is the era of choice for Victorian Steampunk. We could add that Jules Verne, a French man, was one of the inspiration for the whole steampunk genre, and he lived and wrote at the end of the 19th century too.

In short, everything points to the Eiffel Tower for being a steampunk symbol, so it's no real surprise you could see it as an inspiration for structures in Dishonored. And it's no surprise you see it as the location of the final fight of The Saboteur.