Josef Fritzl has been brought back to the house in Amstetten, west of Vienna, where he allegedly abused and jailed his daughter and her children.
Mr Fritzl was brought there under heavy police guard on Thursday to give investigators a tour of the cellar.
Officials say the visit is to help see if the Pole suspect 'echoes Fritzl case' ...
Austrian cellar rapist may be charged with slavery ... cell can be opened from outside.
Mr Fritzl is accused of keeping his daughter for 24 years in a cellar he built, sexually abusing her and fathering seven children with her.
Lawyers for Mr Fritzl insist his captives had been able to leave the cellar but investigators think the door could have been sealed off with metal bars.
Prosecutors say he has confessed to keeping his daughter Elisabeth captive in a cell at his home.
DNA tests have shown he is the father of six of Elisabeth's children and authorities say that Mr Fritzl will go on trial by the end of the year.
Mr Fritzl has been in custody since April and is being held in pre-trial detention in St Poelten, 80km (50 miles) west of the capital Vienna since April.
Earlier this summer a court spokesman said preparations for the trial of Mr Fritzl, 73, were going at "full speed".
His alleged victims, including Elisabeth, 42, are undergoing treatment at a psychiatric hospital.
The case first came to light in April after 19-year-old Kerstin, one of the children fathered by Mr Fritzl, became seriously ill and was taken to hospital.
(BBC)
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