The Bloody Benders of Labette County, Kansas
In the early 1870's travelers making their way westward started disappearing along the Osage Trail. Tracking the last known whereabouts of those missing led investigators to the home of The Bender Family and soon the area they owned became known as "Hell's Half-Acre".
The Mysterious Disappearance of Hoer Verde, Brazil in 1923
On February 5th, 1923 a small town named Hoer Verde and it's 600 inhabitants disappeared with only the phrase "There is no salvation" left on a chalkboard.
It's a mystery that has been popping up more recently thanks to the video game Control in 2019 and a BBC Audio Drama from 2020.