March 25: Feast of the Annunciation in Christianity; Independence Day in Greece (1821)
- 421 – According to legend, the city of Venice (in modern Italy) was founded exactly at the stroke of noon with the dedication of the first church, that of San Giacomo (pictured) at the islet of Rialto.
- 1821 – Metropolitan Germanos of Patras raised the Greek flag in the Monastery of Agia Lavra to symbolically mark the beginning of the Greek War of Independence.
- 1911 – The Triangle Shirtwaist Factory fire in New York City killed more than 140 garment workers, many of whom could not escape the burning building because the managers had locked the doors to the stairwells and exits.
- 1949 – The Soviet Union began mass deportations of over 90,000 people from the Baltic states to Siberia.
- 1975 – King Faisal of Saudi Arabia was shot and killed by his nephew Faisal bin Musa’id.