Governor's House, Dumbarton Castle

This area of the castle has in its time been subject to major reconstruction work in the early 18th century, when the medieval Gatehouse was demolished and replaced by the current Governor's House. This Gatehouse extended into the present garden where its remains may still be in situ. Quoted from the Canmore website

This location was used in the 2008 film, The 39 Steps, starring Rupert Penry-Jones, Lydia Leonard, David Haig, Eddie Marsan, and Patrick Malahide.

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Filming took place on location in Scotland. Locations used included the area around West Register Street in Edinburgh for the London scenes at the start of the film, Bo'ness railway station, Kelvingrove Art Gallery and Museum for the interior scenes of St Pancras railway station, Glasgow City Chambers, Culross, Stirling Castle, Dumbarton Castle, the highlands of Argyll and Loch Katrine, used for the finale. Quoted from Wikipedia