The Twilight Zone Tower of Terror at Walt Disney Studios Park is based on the same designs as the version at Disney's California Adventure. However, it was originally Imagineered for the Paris park at the same time as Tokyo's tower and planned to open just 2 years after the opening of the park itself.
When financial troubles again hit Disney's Parisian resort, the attraction had to be put on hold. In the mean time, it was constructed at Disney's California Adventure as an additional crowd-puller.
The attraction was finally greenlit in 2005 and was under construction right in the center of the park, behind the "La Terrasse" seating area, in early 2006. Upon completion, it was joined by a new themed development producing an outdoor Hollywood Boulevard of faux movie sets. Unlike its American cousins, the Paris Tower was constructed using concrete rather than steel due to French construction guidelines and standards, at a total cost exceeding €180 million.
The Paris and California versions were originally believed to become identical versions upon completion, but some differences remain, notably the height of the building, the location of some rooms backstage as well as other differences due to construction and work regulations being stricter in France.
The name of the attraction in French is La Tour de la Terreur - Un Saut dans la Quatrième Dimension. (The Tower of Terror - A Jump into the Fourth Dimension)
The default audio language for the pre-show library video and the ride is French, but can be changed to English by the Cast Member. The library video is the same as the American version but is dubbed in French and subtitled in English.
The Walt Disney Studios version opened on December 22, 2007. The official opening to the press was April 5, 2008.
Pictures and Information fromDLRPMagic, Pin Pics, and Tower of Terror.org