The Roswell crash, probably one of the most famous alleged incidences to have occurred in the history of UFOs.
It is also probably one of the best things to most likely to have never have happened to that town of Roswell, New Mexico too.
Regardless whether or not an alien space craft crashed on a ranch outside the city, or if it was a combination of a experimental military balloon from Project Mogul and Project High Dive, along with hoaxes and other myths that have been generated because of the crash, the one true reality is that just about everyone knows about Roswell, New Mexico, and what is to have allegedly occurred there 65 years. Because of that it has become a huge tourist attraction for people who are into UFOs and curiosity seekers alike.
If it wasn't for this alleged UFO crash no one would really care about this place. It would just be a small city in the middle of the desert who's only one real tourist attraction would be the old Walker Air Force Base. Heck, the only reason why anyone would want to go to the old Air Force base there today is because that is where the alleged alien space craft and bodies were being held at after the "crash" in the first place.
There are other places there that attract wannabe UFO investigators as well, such as the alleged crash site, and the International UFO Museum and Research Center, which generates the community loads of money in terms of tax revenue and sales of things like food and lounging and souvenirs, and all sorts of other things that tourists tend to buy.
There has also been a huge amount of media centered around the city and the alleged UFO crash there as well, be it books, TV shows, documentaries, movies, video games, or magazine articles. All of this only increases the mythology of this alleged crash, which in turn increases the popularity of this place, thus increasing the amount of tourism to this place, which puts more money into the community. There was even an entire television series during the late 1990's and early 2000's called Roswell that centers around four aliens that survived the crash and disguise themselves as human teenagers...
Now I have seen pictures of Roswell and I admit it's a beautiful little city. I won't even mind living there if it wasn't for the fact that it is in the middle of a desert. In fact there is a lot more there to see then just a bunch UFO attractions, but that's not what people go there to see. They go there to see the site of something that most likely never happened, but in their minds is the greatest historical event in human history, and one of the biggest conspiracies in human history as well, rather then the crash of some high altitude military equipment that no one really cared about until the late 1980's.
While I don't like ignorance and the continued promotion of things that most likely never happened, I have to admit that this alleged crash is most likely the best thing that never happened to Roswell, New Mexico.