Armenian Genocide Remembrance Day
1479 BC – Thutmose III became the sixth Pharaoh of the Eighteenth Dynasty of Egypt, with his aunt Hatshepsut as co-regent.
1800 – The Library of Congress (building pictured), the de facto national library of the United States, was established as part of an act of Congress providing for the transfer of the nation's capital from Philadelphia to Washington, D.C.
1914 – The Franck–Hertz experiment, the first electrical measurement to clearly demonstrate quantum mechanics, was presented to the German Physical Society.
1980 – Eight U.S. servicemen died in Operation Eagle Claw, a failed attempt to rescue the captives in the Iran hostage crisis.
2013 – A building in the Savar Upazila of Dhaka, Bangladesh, collapsed, killing 1,134 people, making it the deadliest accidental structural failure in modern history.