He is believed to have died after shooting himself in a Berlin bunker in 1945 when he realised Germany had lost World War II.
But a startling new book claims Adolf Hitler actually escaped his hideout and died incognito in 1984 in a small town near Brazil's border with Bolivia - and it can be proved by a picture.
Not only that, but the author believes the Fuhrer fled to Argentina and then Paraguay before settling in the Brazilian state of Mato Grosso to hunt for buried treasure - with a map given to him by Vatican allies, according to its author.
As part of his elaborate ruse to escape detection, he also had a relationship with a black woman called Cutinga, which was meant to prove that he could not be the dictator who hated anyone who did not fit his Aryan ideal, the book claims.
Post-graduate student Simoni Renee Guerreiro Dias has outlined her bizarre theory, claiming the fascist actually died aged 95.
The book, titled 'Hitler in Brazil - His Life and His Death', challenges the accepted view that the dictator shot himself in his Berlin bunker on April 30 1945.
She claims he may have lived as Adolf Leipzig in the small town of Nossa Senhora do Livramento, 30 miles from the state capital Cuiaba.
Simoni, a Brazilian who comes from Cuiaba, says Leipzig was known locally as the 'Old German.'
Simoni is now planning to use DNA tests using a relative of Hitler living in Israel, after been given permission to exhume Adolf Leipzig's remains from his alleged final resting place in Nossa Senhora do Livramento.
The journalism student has linked the Fuhrer's alleged arrival in the area to a Vatican offer of ownership rights over buried Jesuit treasure in a cave near his adopted home.
She says her suspicions about Adolf Leipzig increased after she photoshopped a moustache on to the grainy picture she obtained of him and compared it to photos of the Nazi leader.