May 25 is the 145th day of the year according to the Gregorian calendar (146th in the leap year). 220 days left until the end of the year. Viola has a holiday.
1872 - After a torrential rain, a flood broke out in Bohemia and the dam of the Mladotický pond in the Plzeň region burst. 337 people died during the floods.
1891 - The Kysibelka balloon was launched for the first time at the Jubilee Provincial Exhibition in Prague.
1917 - An explosion in an ammunition factory in Pilsen killed about 202 people.
1970 - The Žďárské vrchy Protected Landscape Area was declared.
1997 - A suicide blast occurred in the Priessnitz sanatorium in Jeseník. The perpetrator Bohumil Šole, a former employee of Synthesis, died in it.
1810 - Declaration of independence of Argentina.
1721 - At the Battle of Selånger during the Northern War, Russia triumphs over Sweden.
1793 - French Revolutionary Wars: Royalists led by the Marquis de Lescure defeat the French Republican army led by General Alexis Chalbos at the Battle of Fontenay-le-Comte.
1948 - Witold Pilecki, a Polish anti-Nazi and anti-communist fighter, is executed in a fabricated political trial.
1955 - British climbers George Band and Joe Brown first climb the world's third highest mountain, Kanchenjunga.
1961 - In his speech, US President John F. Kennedy states that the United States should transport humans to the moon and safely back to Earth by 1970 under the Apollo program.
1963 - In Addis Ababa, Ethiopia, 32 African countries establish the Organization of African Unity.
1977 - Premiere of Star Wars: Episode IV - New Hope.
1979 - A DC-10 plane crashes on the scheduled flight from Chicago to Los Angeles, killing all 271 people on board.
1998 - The first physically handicapped climber, one-legged American Tom Whittaker, ascends the world's highest mountain, Mount Everest.
2013 - A protest march against Monsanto took place, with 2 million people taking part in many cities around the world.
2014 - Petro Poroshenko wins the first round of the presidential election in Ukraine.
For an automatic alphabetical list, see Category: May 25th Births
1335 - Margaret of Luxembourg, Princess, daughter of Charles IV, Queen of Hungary († September 7, 1349)
1847 - Jan Nepomuk Kapras, pedagogue, psychologist and philosopher († June 15, 1931)
1848 - Jan Urban Jarník, novelist, supporter of Czech-Romanian relations († January 12, 1923)
1849 - František Ženíšek, painter († November 15, 1916)
1852 - Eduard August Schroeder, lawyer and sociologist († February 16, 1928)
1854 - Otokar Mokrý, poet, journalist and translator († January 1, 1899)
1855 - Anton Rzehak, geologist and archaeologist († March 31, 1923)
1867 - Antonin Foerster, Slovenian piano virtuoso of Czech origin († January 9, 1915)
1868 - Otokar Bém, architect († October 28, 1949)
1872 - Ján Janík, Czechoslovak politician († June 25, 1951)
1877 - Augustin Stefan, Czechoslovak politician (†?)
1888 - Alois Srdce, bookseller and publisher († January 31, 1966)
Ferdinand Pujman, dramaturg, director of the opera of the National Theater in Prague and esthetician († 17 December 1961)
Hugo Sonnenschein, German poet and anarchist († July 20, 1953)
1891 - Olga Masaryková, daughter of President Tomáš Garrigu Masaryk († September 12, 1978)
1894 - Čeněk Junek, car racer († July 15, 1928)
1897 - Rudolf Šedivý, victim of communist totalitarianism († September 18, 1970)
1901 - Břetislav Chrastina, a member of the Spelter airdrop († June 11, 1971)
1902 - Jaroslav Rössler, avant-garde photographer († January 5, 1990)
1904 - Jan Sokol, architect († September 27, 1987)
1905 - Ladislav Tikal, Czechoslovak gymnast, Olympian († June 30, 1980)
1910 - Antonín Haas, archivist († December 17, 1971)
1911 - František Horák, book