Barts Museum in the City of London is Britain's oldest working hospital on its original site, founded in 1123 by Rahere. Housed in the Grade I listed North Wing, it reopened in October 2025 after a £5.3m restoration. Entry is free. Highlights include the Great Hall, Hogarth's murals, and the Henry VIII Gatehouse with London's only public statue of the king. Famous names: Florence Nightingale, Elizabeth Blackwell, James Paget. Literary link: Sherlock Holmes met Dr Watson here. Nearby: St Bartholomew-the-Great church and Smithfield Market. Open Mondays, Tuesdays, and first Sundays.