The top grossing film of 1962.
The train station in the film at "Gold City" was shot at Perkinsville, Arizona, and is still standing, although in a state of disrepair. It is now the mid stopping point of the Verde Canyon Scenic Railroad. The train station, the town sign and several other smaller buildings still exist.
This was one of only two films made in true Cinerama which were shown in regular theatres after their first runs. None of the previous Cinerama films were ever shown in regular theatres because they were travelogues and documentaries made only to show off the process, as opposed to telling a story, and it would have been pointless to show these in a "regular" format.
This would later inspire an ABC TV series of the same name that ran for a total of 11 episodes in 1979.