"a visit to the British Museum"

The British Museum in London is a museum of human history and culture, founded in 1753.

British Museum, London
GNU Free Documentation LicenseBritish Museum, London - Credit: Steff, Wikimedia Commons

Amongst its most famous exhibits are the Rosetta Stone, the Elgin marbles, and the Sutton Hoo treasure.

An item from the Sutton Hoo treasure collection
Creative Commons AttributionAn item from the Sutton Hoo treasure collection - Credit: Rachel Scott Halls, Flickr

When Virginia Woolf wrote A Room of one's own, the 'national collection' of books was housed at the British Museum, and it was possible for researchers (like the 'narrator') to consult them in 'the Reading Room'. The collection was subsequently moved to the British Library at St. Pancras, London.