Changes
/* Attraction History */
As far as the layout of the attraction was concerned, it was decided that guests would enter the attraction on foot. Here, they would discover an abandoned hotel lobby, setting the mystery into motion <ref name= "Martin"> http://www.martinsvids.net/?s=Tower+of+Terror </ref>. Guests would then watch a preshow video, which would tell guests the attraction's backstory <ref name= "Martin"/>. The attraction would then conclude with guests going into the haunted elevator (the drop shaft) and discovering what really happened in the hotel<ref name= "Martin"/>.
One problem that Imagineers had to overcome when designing the Tower of Terror was that most drop rides usually involved guests laying on their backs. Disney felt that this may not be the most family friendly option, and they attempted to find a new ride method<ref name= "Martin"/>. Partially based on the ride mechanism that was designed for Geyser Mountain, Disney developed a way to use multiple ride vehicles that would be able to both travel horizontally, and then drop vertically<ref name= "Martin"/>. The addition of multiple shafts also let Imagineers increase the capacity of the attraction<ref name= "Martin"/>.
With both the attraction plot and the ride mechanisms complete, construction on the Tower of Terror began in 1992<ref name= "Martin"/>. Imagineers soon ran into trouble however, when it was discovered that the initial site of the Tower of Terror actually sat on sinkhole<ref name= "Martin"/>. This setback required Disney to move the location of the attraction, albeit slightly. Although initially scheduled for a July 4, 1994 opening, the Twilight Zone Tower of Terror (as well as the rest of Sunset Boulevard) opened on July 22, 1994.
Since it's opening in 1994, the Twilight Zone Tower of Terror has seen a significant amount of changes. In May of 1996, a second drop was added to the attraction<ref name= "Martin"/>. Besides the original thirteen-story drop, guests now also fell eight stories. During this refurbishment, the first photo that was taken of guests was also removed<ref name= "Martin"/>. The photo was originally taken early on in the attraction, and then used later in the 5th Dimension scene<ref name= "Martin"/>. The idea was that guests would be able to seem themselves in their ride vehicle as they entered the 5th Dimension<ref name= "Martin"/>. Unfortunately, the process was unreliable and in 1996 the effect was removed<ref name= "Martin"/>. Further additions came to the Tower in 1999, when a third drop was added to the attraction<ref name= "wdwmagic"> http://www.wdwmagic.com/attractions/the-twilight-zone-tower-of-terror/news/25feb1999-tower-of-terror-fear-every-drop-profile-announced.htm </ref>. The update was known as The Twilight Zone Tower of Terror: Fear Every Drop! At this time, new lighting effects and music were added, and the lightning effect was updated <ref name= "wdwmagic"/>
The most recent change to the Tower of Terror came in 2002, when the drop sequences became randomized by a computer <ref name= "Martin"/>. This allowed every ride on the Tower of Terror to be different and unique, meaning that guests could never be sure when they were going to drop<ref name= "Martin"/>.
