I know I'm late to the party, but here goes...
What happened on the Marie Celeste.I was going to post this one. I'm fascinated by people who disappear from places as entire ships and towns, yet everything look in place (food on the table, laundry getting ready to wash, etc.)
1) Story elements such as food being laid out on the table and the ship sailing itself into the harbor were inventions of Sir Arthur Conan Doyle. Even the appellation of "Marie" instead of "Mary" Celeste was Doyle's doing.
2) The Bell Witch: About 99% of the popular legend of the Bell Witch came from a book by a guy named Martin Ingram. His claimed sources--the diary of one of the Bell sons and some newspaper articles-- have been shown never to have existed.
As for Amelia Earhart, a female skeleton of the right size, plus debris including a navigation system idential to the one she was known to have been using were all found on a pacific island, near her expected route.
Weirdly, this was all found in 1940, but I guess the myth had become much more interesting than any explanation could ever be, so nobody gets told that part.
3) Unfortunately, none of that is true. The skeleton was male. The navigation system found near the skeleton was an empty wooden box that somebody said must have been the box Noonan kept his sextant in before actual examination of it revealed it was almost certainly not a sextant box (and even if it was there's no reason to believe it was his
sextant box). And the island the skeleton and box were found on was nowhere near their expected route. There's really no way they could have made as huge a navigational error as would be necessary for them to end up there.
4) Re the Dyatlov Pass victim with no tongue: It was several weeks before the bodies were found-- ample time for (nonfictional) wild predators to have scavenged the bodies.
What really happened to the Russian royal family? I know that all their remains have now been found, but there was clearly enough doubt and uncertainty over their deaths to inspire stories of Anastasia having survived. We studied the Russian revolution in secondary school (admittedly a while ago) and I remember there were several conflicting accounts of the events.
5) The isolationist bent of the Soviet Union is the main reason conflicting stories were able to circulate for so long. People have been allowed to actually investigate since the Soviet Union fell, and forensic evidence in the past ten or so years has confirmed the account of the officer in charge of the massacre. The entire family plus a couple of maids were killed in the basement of the house where they were being held. The bodies were mutilated to keep them from being identified and buried in two graves.
6) The Min Min Lights are a superior mirage.