- 356 BC Herostratus sets fire to the Temple of Artemis in Ephesus, one of the Seven Wonders of the World.
- 365 Crete Earthquake followed by tsunami around the Eastern Mediterranean allegedly destroys Alexandria
- 1904 After 13 years, the 4,607-mile Trans-Siberian railway is completed
- 1969 Neil Armstrong becomes the first person to step on the Moon at 2:56:15 AM (GMT)
- 1970 Aswan Dam opens in Egypt, enables human control of the flooding of the Nile
- 2015 HistoryOrb.com becomes OnThisDay.com
In the market square of Springfield, Missouri, Wild Bill Hickok shoots and kills Davis Tutt in what is regarded as the first true western showdown.
On July 21, 1865