The Enigma of Amigara Fault is a bonus story in Junji Ito's [wiki] 2003 horror manga Gyo. In the story, an earthquake revealed a mysterious wall with thousands of deep, human-shaped holes - each hole is a perfect shape for someone. When a person finds his "hole," he is compelled to enter ... but the hole is such that he can't turn around or go back. What happened to those who walk into their holes?
In about a page or two, I was hooked. Find out how this creepy story ends: Link (It's a manga, so read from right to left) - Thanks Chad!