1820 is a year in the 19th century.
Event[]
- Date Unknown: Ebiffnezer Tannen sees his own wing completed in Debtor's prison[1], which up to December 24, 1845 has seen no prisoner being released
- Friday, May 12: Florence Nightingale, whom the Florence Nightingale effect was named after is born in Florence, Grand Duchy of Tuscany.
Appearance[]
- Back to the Future: The Animated Series
- "Dickens of a Christmas" (Inferred when mentioned in 1845 that no one been let out in the last 25 years.)