National Museum

The National Museum was a large museum in central London.

History
When first encountering Helen Sinclair, River Song recalled attending "outrageous" parties at the museum hosted by the Ladies Badminton Team in the 1880s and 1920s. (AUDIO: The Sonomancer)

In the 1960s, Helen Sinclair worked at the museum as a language scholar, (AUDIO: The Red Lady) specifically a specialist in translation in the Department of Linguistics. (AUDIO: The Sonomancer)

In 1963, the Eighth Doctor and Liv Chenka arrived there while investigating a temporal anomaly relating to the Eleven's escape from Gallifrey. There they encountered Helen Sinclair, whom they worked with to investigate the "Red Lady". After artefacts containing the "Red Lady" went "missing" under her watch, Helen was fired and subsequently joined the Doctor's TARDIS crew. (AUDIO: The Red Lady)

By 1998, George Sinclair noted that the loss of all the "Red Lady" artifacts was considered the biggest theft in National Museum history. (AUDIO: Absent Friends)

Alternate timeline
The Pandorica was displayed there in an alternate 1996, alongside stone Daleks and other things. Seven-year-old Amelia Pond and her aunt Sharon went to see it that year at Amelia's insistence, unaware that Pandorica contained her adult self.

In this timeline, the Pandorica, two stone Daleks, several dinosaur skeletons, a mounted polar bear, several mounted Nile penguins, and an Egyptian sarcophagus were present in the museum.

Rory Williams, or rather the Auton duplicate of him, was employed as a night guard. He and the Eleventh Doctor rescued Amy's two incarnations from the stone Daleks. The Doctor subsequently launched himself in the Pandorica from within the museum in order to re-boot the universe. (TV: The Big Bang)

Behind the scenes
Scenes in and around the National Museum were filmed in the National Museum of Wales, Cardiff.