1257 - Krakow (Poland) becomes a city.
1799 - Natural scientists Alexander von Humbolt and Aimé Bonpland sail from A Coruña and begin a five-year expedition through Latin America.
1805 - First registered tornado in "Tornado Alley" (southern Illinois).
1806 - The Republic of Batavian becomes the Kingdom of the Netherlands.
1849 - NATIONAL DAY OF DENMARK - Denmark becomes a constitutional monarchy.
1873 - Sultan Bargash abolishes the slave trade in Zanzibar.
1972 - The First UN Conference on Environment was held in Stockholm. Since then, June 5 has been declared an ENVIRONMENTAL WORLD DAY.
