The Museo dell’ Opera del Duomo was formed in 1882 and moved to Palazzo Soliani in 1897. This closed in 1989 and the collection was inaccessible to the public for a considerable period. It was laid out in the first floor of the Palazzi Papali and opened to the public in 2006.
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✴The ticket office and the first room of the museum, the Sala degli Affreschi are in the room above the old episcopal library.
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✴The Sala della Maestà (Room II) is at the top of the entrance staircase.
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✴Room III is in a space sometimes referred to as the chapel of the palace of Pope Martin IV;
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✴Room IV is in the main room of this palace;
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✴Room V is in the palace of Pope Nicholas IV; and
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✴the Sala delle Sinopie (Room VI) is in the palace of Pope Urban IV.