Giving Aokigahara forest a run for its money as creepiest place ever is Mount Everest. One of the worst things about scaling Mount Everest, besides the lack of oxygen & hellish conditions, are the dead bodies everywhere. Over 200 people have died in the attempt, and most are still there. The same conditions that make it so dangerous to survive the climb also help preserve the dead bodies. Recovering the dead would be a dangerous and expensive risk. Often the bodies are used as landmarks.
Jeweled skeletons from the 1600's, taken from the catacombs of Rome in the 17th century, the relics of twelve martyred saints were then attired in the regalia of the period before being interred in a remote church on the German/Czech border