2013: A gas cylinder explodes on a school bus in the Pakistani city of Gujrat, killing at least 18 people.
2013: Suspected Maoist rebels kill at least 28 people and injure 32 others in an attack on a convoy of Indian National Congress politicians in Chhattisgarh, India.
2009: North Korea allegedly tests its second nuclear device. Following the nuclear test, Pyongyang also conducted several missile tests building tensions in the international community.
2008: NASA's Phoenix lander lands in Green Valley region of Mars to search for environments suitable for water and microbial life.
2000: Liberation Day of Lebanon. Israel withdraws its army from Lebanese territory (except for the disputed Shebaa farms zone) 22 years after its invasion in 1978.
1973: HNS Velos, while participating in a NATO exercise and in order to protest against the dictatorship in Greece, anchored at Fiumicino, Italy, refusing to return to Greece.
1968: The Gateway Arch in Saint Louis is dedicated.
1961: Apollo program: U.S. President John F. Kennedy announces before a special joint session of the Congress his goal to initiate a project to put a "man on the Moon" before the end of the decade.
1955: First ascent of Kangchenjunga (8,586 m.), the third-highest mountain in the world, by a British expedition led by Charles Evans. Joe Brown and George Band reached the summit on May 25, followed by Norman Hardie and Tony Streather the next day.
1955: In the United States, a night-time F5 tornado strikes the small city of Udall, Kansas, killing 80 and injuring 273. It is the deadliest tornado to ever occur in the state and the 23rd deadliest in the U.S.
1953: The first public television station in the United States officially begins broadcasting as KUHT from the campus of the University of Houston.
1953: At the Nevada Test Site, the United States conducts its first and only nuclear artillery test.
1946: The parliament of Transjordan makes Abdullah I of Jordan their Emir.
1940: World War II: The German 2nd Panzer Division captures the port of Boulogne-sur-Mer; the surrender of the last French and British troops marks the end of the Battle of Boulogne.
1895: Playwright, poet, and novelist Oscar Wilde is convicted of "committing acts of gross indecency with other male persons" and sentenced to serve two years in prison.
1644: Ming general Wu Sangui forms an alliance with the invading Manchus and opens the gates of the Great Wall of China at Shanhaiguan pass, letting the Manchus through towards the capital Beijing.