While in London, I spent an afternoon at the British Library and saw Jane Austen's manuscript, as well as her desk. The manuscript was of a story she wrote as a teenager, and the notebook was left open so visitors could see her handwriting.
Jane Austen is one of my all-time favorite authors, so I stood in front of this for a long time, hoping to absorb some of the greatness and skill that emanated from the pages.
Additionally, I also saw a manuscript from the poet Robert Browning, and music written by Handel and Schubert, and lyrics written on scrap paper by The Beatles!
Photograph of Jane Austen's "History of England," from Austenonly.com. (The British Library forbids visitors from taking photographs.)