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The Delerium Archive was a museum which took up most or all of an asteroid, and was the final resting place of the Headless Monks. The Doctor stated it to be "the biggest museum ever". It was implied he visited often, and used it to "keep score", however, he may have been referring to museums in general, of which this is just one of the places he frequented.
River Song deduced that eventually, the Doctor would at some point end up at the Delerium Archive and find the Home Box of the Category 4 Starliner "Byzantium". Thus, she was able to leave a graffiti message in old High Gallifreyan on it, alerting him to her needing his help. She did not know, however, that the Byzantium would crash. He eventually did, roughly 12,000 years, in the 171st century after the 51st century. (DW: The Time of Angels)
The Museum was known to contain Magnatine Dynasty crystals, which, according to the Doctor, were "so beautiful they'll make your hair go curly with delight, or maybe with boredom". (NSA: The Forgotten Army)