Even before production for “Outlander” Season 3 begins officially, the cast and crew have reportedly started filming some of the scenes “secretly.” The filming is said to have taken place in Glasgow.

Some of the cast and crew members were spotted filming “secretly” at the now closed Victoria infirmary, which is one of the hospitals in Glasgow, Evening Times reports. The building has remained empty after all the patients were transferred to Queen Elizabeth University Hospital in May last year, giving the producers full access to the building.

The hospital first opened in 1890 and is now being sold to the housing firm Sanctuary Housing. The filming of the scenes for the popular Starz TV series was the last thing that happened in the building before its sale, an insider has revealed.

The insider said that it was “quite special” to have the cast and crew film their scenes and record the building as it is “for history.” The TV series has already won praise for the accurate depiction of life in 1740s Scotland and “Outlander” Season 3 appears to be helping to preserve the history of an ancient building.

The report notes that this is not the first time that the producers have used locations in Glasgow for the Starz TV series. They had previously used Necropolis to stand in for Paris and they also filmed in Pollok Park and Glasgow Cathedral.

The next season is based on the third book by Diana Gabaldon titled “Voyager.” The story will now take the main characters to exotic new locations like Jamaica. The producers are yet to release a full list of filming locations of the show.

“Outlander” Season 3 is expected to premiere sometime in 2017. It is not clear if the scale of the production will affect the filming schedule this time around.