On a thread on "Pub Talk" I suggested that possibly we should have a thread simply dealing with those cases that are of people or objects or lands (hello Atlantis) that have disappeared, either in actuality or in legend with possible grounding in actuality (again Atlantis). These are (to paraphrase Canadian Prime Minister Mackenzie) "not necessarily murder cases, but murder cases if we find them necessary."
To try to start this off, I will list my initial choices of the best known vanishing acts. Keep in mind, when dealing with people, homicide may be in the background. Certainly kidnapping can be for some (if not all) of the children that turn up missing.
Atlantis (to start at the beginning)
The creators of the statues on Easter Island
The first colony on Greenland
Hi/Hy-Brazil and other islands in the Atlantic "maps" before Columbus
The "Lost Colony" of Roanoke
John Cabot's last exploration
The Corte Real Brothers and their men
La Perouse's final fate (partially discovered in the early 19th Century)
Sir John Franklin's last expedition (of which more information is forthcoming in the coming years)
City of Glasgow
Collins liner "Pacific"
City of Boston
Star Ariel and her sister "Star" airplane
Amelia Earhart/Fred Noonan's plane
Sir Charles Kingford-Smith's plane
Nungasser and Coli's plane (and did they actually get to North America or crash into the Atlantic)
New York State Chancellor John Lansing (vanished 1829)
William Morgan (revealer of Masonic information) (vanished in 1826)
Charlie Ross (kidnapped in 1874)
Amelia Jeffs (one of the West Ham cases - although they did find Ms Jeff's dead body, and they did sort of guess what happened)
Justice Joseph Force Crater
This list will give an idea of what I am talking about. Please feel free to enter into discussions on these and similar disappearances.