2. Japan — The Setagaya family murder, aka the "Goldilocks Murder," which refers to the unsolved murder of the Miyazawa family who lived in the Setagaya neighborhood of Tokyo where they were brutally stabbed to death in December 2000.
3. Mexico — The death of Paulette Gebara Farah, a 4-year-old girl who disappeared, but was later found dead under suspicious circumstances. Her body was discovered seemingly hidden in her own bed.
4. Canada — The "Highway of Tears", which is a 450-mile corridor of Highway 16 in British Columbia, and a location where many Indigenous women have gone missing and or been murdered since at least 1986.
5. Italy — The story of serial killer Leonarda Cianciulli who lured, then killed three women in her Italian village, and then turned them into soap to give to other people in the neighborhood.
6. Finland — The Lake Bodom murders, which involved the killing of three friends and the surprising survival of a fourth, is considered one of the most infamous unsolved homicide cases in Finland's history.
7. Bulgaria — The mysterious and confusing disappearance of Lars Mittank, a young German man on vacation in Bulgaria who was last seen on security footage running out of an airport and into a nearby forest.
8. France — The Dupont de Ligonnès murders, which involved the murder of five members of the Dupont de Ligonnès family (as well as their two dogs) and the disappearance of the father, Xavier, who is considered the prime suspect, in 2011.
9. South Korea — The deeply upsetting "Frog Boys" case about a group of five young boys who went missing for over a decade, until their remains were found with evidence of trauma.
10. Panama — The deaths of Kris Kremers and Lisanne Froon, Dutch students who went on a hike in Boquete, a small mountain town in Panama, in 2014 and never returned.
11. Australia — The unsolved case of Phoebe Handsjuk, a 24-year-old woman in Melbourne whose body was found after she'd apparently fallen several stories, feet first, down into a high-rise building's garbage chute. Although her family believes someone put her into the garbage chute, her death remains a mystery.
12. Finland — The Hausjärvi gravel pit murders, a series of two (and possibly more) violent crimes committed outside Helsinki in the 1990s by what is believed to be one perpetrator, known in the Finnish media as the Järvenpää Serial Killer.
13. Canada — The murder of Barry and Honey Sherman, billionaires who were found dead, strangled in their Toronto home in 2017. Although investigators initially speculated that the case was a murder-suicide, police later concluded that there was evidence of a homicide, saying they believed the couple was targeted.
14. China — The Nanjing University mutilation case about a 19-year-old university student, Diao Aiqing, whose mutilated body parts were found scattered across different parts around the province of Jiangsu.
15. England — Jack the Ripper, an unidentified serial killer who mainly targeted sex workers in impoverished areas of London in 1888.
16. Australia — The disappearance of the Beaumont children near Adelaide in 1966, who were believed to have been abducted and murdered.
17. Canada — The disappearance of Melanie Ethier, a teenager who went missing in New Liskeard, Ontario, and was last seen around 1:30–2 a.m. leaving a friend's house to walk home alone. Later that morning, Melanie's mother became concerned when she realized her daughter was not home and then did not show up to work later that day.
19. Norway — The "Isdal woman" case about an unidentified woman whose burned body was discovered in a remote part of the Isdalen valley on Nov. 29, 1970. Although many clues were found by authorities, her identity and mysterious death remain unsolved.
20. Belgium — The "Brabant Killers", aka the "Nijvel Gang" and "the mad killers of Brabant," who committed violent attacks, robberies, and murders in the central province of Brabant in the early to mid-'80s.
21. New Zealand — The disappearance of Amber-Lee Cruickshank, a two-year-old toddler who was last seen on Oct. 17, 1992 and whose case shook the small town of Kingston where she lived.
22. Australia — The mystery of the Somerton Man, an unidentified man found dead on a beach in Somerton Park (a suburb of Adelaide) who had a scrap of paper with "tamám shud," meaning "ended" or "finished" on it.
23. England — The suspicious death of Gareth Williams, a British intelligence employee who was possibly assassinated in August 2010.
24. Russia — The Dyatlov Pass incident where nine people died in the mountains of Russia under very bizarre circumstances in 1959.
25. England — The strange and tragic death of Corrie McKeague, an RAF gunner who was last seen on CCTV footage entering a bin loading area before disappearing in Bury St Edmunds in 2016.
26. Australia — The case of Harold Holt, a former Australian prime minister whose disappearance in 1967, while he was still in office, spawned several conspiracy theories — including wild ones like that he'd been taken by a Chinese submarine. Although his body was never found, Holt was later presumed dead.
27. Lastly, Portugal — The widely publicized Madeleine McCann case about a three-year-old British girl who went missing from her bed in 2007 while her family was on vacation in Portugal.
Note: Some submissions have been edited for length and/or clarity.
If you or anyone you know has information on a missing person case, call local law enforcement first. You can also contact the National Center for Missing & Exploited Children at 1-800-843-5678 (THE-LOST) or visit the National Missing and Unidentified Persons System site for regional case assistance.