Crush, Texas was a temporary “city” established as a one-day publicity stunt in 1896. In 1896 William G. Crush, general passenger agent of the Katy Railroad, conceived the idea to demonstrate a train wreck as a spectacle. No admission was charged, and train fares to the crash site were at the reduced rate of $5 from any location in Texas. As a result between 30,000 and 50,000 people showed up on September 15, 1896 making the new town of Crush, Texas the second largest city in the state.

Wikipedia

Here’s a great story of the event.