Max Pearson presents a collection of this week's Witness History episodes.
American artist Keith Haring's bold 1986 mural on the Berlin Wall and British naturalist Gerald Durrell's 1950s mission to save species from extinction.
We discuss other examples of art which aim to bring peace and unity around the world with Dr Lucy Weir, head of art history at the University of Edinburgh.
Plus Malta's divorce referendum in 2011, Hungary's 1956 uprising, the first Refugee Olympic Team of 2016 and how Ten Canoes made cinema history in Australia in 2006.
Contributors: Alexandra Hildebrandt - the chairwoman of the Wall Museum at Checkpoint Charlie in Berlin. Dr Lucy Weir - the head of the history of art at the University of Edinburgh. Gerald Durrell - British naturalist. Jeffrey Pullicino Orlando - Maltese MP. Péter Pallai - survivor of the Hungarian uprising. Frances Djulibing - actor in Ten Canoes. Rose Lokonyen - 800m runner for the Refugee Olympic Team.
(Photo: Keith Haring painting his mural on the Berlin Wall in 1986. Credit: Patrick Piel/Gamma-Rapho via Getty Images)