Roman Holiday at Palazzo Colonna: the ending, and only the ending
One scene, and why it is the one
Film locations grow. A building gets one scene, a guidebook rounds it up to “scenes”, and within a decade the whole picture was shot there. You may see this palace credited with more of Roman Holiday than it has ever claimed for itself.
So, plainly: the ending. The press conference, in the Great Hall, in a film released in 1953. If you want more of the film’s Rome you will find it outside, and not here, because this site is about one building.
The room it happens in
It is the gallery — the second stop on the route, up a short flight of stairs from the first, with a cannonball from 1849 lodged in those stairs. The room works on film for the same reason it works in person: it was built as one continuous space rather than a run of chambers, so a camera can hold the whole thing at once and a crowd of extras still looks small in it.
Its length is not published, and the page on the Great Hall describes what is known about the room instead.

What else is known
The palace publishes one sentence about the film, and that sentence is the account given here.
Standing in it
Friday morning by reservation, or Saturday between 9:15 and 13:15. That is the entire window, and it is the same window for everything else in the building — the hours and the two doors are here.
Go in knowing which end of the room the scene uses and then look at the ceiling instead. The vault was finished in 1702 and carries the Battle of Lepanto; the film crew had a better set than they could have built and the reason is up there.
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Frequently asked questions
Was Roman Holiday filmed at Palazzo Colonna?
The ending scene was. The operator states that the ending of the 1953 film, starring Audrey Hepburn and Gregory Peck, was shot at the gallery. That is the whole claim — no other scene is attributed to the building.
Which room is the Roman Holiday press conference?
The Great Hall, the gallery itself, which is the second stop on the operator’s route through the palace.
Can you visit the Roman Holiday room?
Yes, on the ordinary ticket. The Great Hall is on the route, and the route runs on Friday mornings by reservation and on Saturday from 9:15 to 13:15.