Creepy footage filmed by Anatoly Moskvin shows the bodies, including three-year-olds he exhumed after visting more than 700 cemeteries, sitting around his house in bizarre costumes.
A sick historian dug up 150 graves so he could dress the corpses of dozens of young girls for birthday parties.
Russian Anatoly Moskvin removed the bodies of girls aged between three and 12 to fulfill his twisted fantasies.
He then took them home and turned them into a grisly mummy collection, dressing the bodies and skeletons in stockings and dresses, and even making one look like a teddy bear.
Moskvin, who speaks 13 languages and was described by some as ‘a genius’, also gave the mummified corpses names and organised birthday parties for them.
A video made by Moskvin and found at his apartment by investigators showed a corridor cluttered with wedding dresses and bright, colourful clothes.
In a room the camera zoomed in on the faces of the girls’ faces, wrapped in light beige fabric. His voice over on the video said: “These dolls are made of mummified human remains.”
Police said Moskvin also compiled up-to-date information about the lives of each girl he had dug up and printed off instructions on a computer for how to produce dolls out of human remains.
His macabre obsession was discovered when his parents visited him after returning from holiday.
The 46-year-old from the city of Nizhni Novgorod in central Russia was arrested in 2011, but it has now emerged he will not stand trial for his appalling crimes.
In a 2007 interview with the newspaper Nizhegorodsky Rabochy, or Nizhny Novgorod Worker, Moskvin said he had inspected 752 cemeteries, often traveling some 20 miles a day by foot to find them.
He said he drank from puddles, spent nights in haystacks or at abandoned farms and once even slept in a coffin readied for a funeral.
He said he was repeatedly questioned by police, who then always let him go.
Before he was finally arrested he wrote a piece for a publication on necrology to explain his interest in the dead.
He said that when he was 12, he came across a funeral procession whose participants forced him to kiss the face of a dead 11-year-old girl. He said he later grew interested in the occult.
Three years after his arrest a judge has ruled that he is still not mentally fit enough to stand trial and should remain in a psychiatric clinic.
A prosecution spokesman said: “After three years of monitoring him in a psychiatric clinic it is absolutely clear that Moskvin is not mentally fit for trial.
“He will therefore be kept for psychiatric treatment at the clinic.”