Bessie and Glen Hyde were honeymooning in northern Arizona at the Grand Canyon when they vanished. They were traveling down the Colorado River by scow in October of 1928 and planned to boat through the Grand Canyon. Bessie would have been the first woman ever to do so successfully [source: Japenga].
Glen had run tough rivers before, but Bessie was a boating newbie. The couple ran across other boaters a few weeks before their disappearance who said they got the feeling that Bessie wanted to turn back, but Glen was pushing her on. If they completed the trip successfully, they could go on a paid lecture tour. So this trip was more than just fun – there was money at stake [source: Japenga].
Cut to several months later: The Hydes' boat was discovered that winter, seemingly undisturbed. It was upright and full of supplies, but the couple was gone. There are many theories about what happened to the Hydes. Did they disembark and try a too-difficult side hike? Did they have an argument that turned violent? Or were they abducted? There are conflicting reports about what happened to the Hydes, and more than one Bessie Hyde sighting in the years that followed [source: Japenga].