Outlander is continuing to film season three on a weekly basis, and filming has moved to Craigmillar Castle. Sources are saying that it will stand in for Ardsmuir Prison, but nothing has been confirmed.
Craigmillar Castle is located in Edinburgh, Scotland and the original tower was built in the late 1300s. Mary Queen of Scots stayed at the castle in 1566.
Updated (9/16/2016): New photo added.
Please note that Craigmillar Castle will be closed from 5th-19th September inclusive. #hsclosure
— Historic Scotland (@welovehistory) September 10, 2016
@OutlanderFem uni has been so busy… this is as close as i got pic.twitter.com/bLk022HfiX
— Emma Harvey (@eharve30) September 15, 2016
¡Rodaje de #Outlander en Edimburgo! Esta semana están grabando la 3ª temporada en el castillo de Craigmillar 😀 pic.twitter.com/GGKeEvDBzW
— Angie Castells (@MasEdimburgo) September 13, 2016
Source: Historic Environment Scotland, respective Twitter accounts, Angie Castells, Daily Record, Edinburgh News