1. The New York Stock Exchange was founded on September 27, 1792: The NYSE was founded by a group of 24 brokers who signed the 'Buttonwood Agreement', which agreed to trade securities on a commission basis, and was held under a buttonwood tree near Wall Street in lower Manhattan.

2. The cornerstone of the New York Public Library was laid on September 27, 1902: The New York Public Library is the second largest library in the United States, and was opened to the public in 1911.

3. The famous 'Battle of the Sexes' tennis match took place in New York on September 27, 1973: Billie Jean King defeated Bobby Riggs in a match watched by millions worldwide, which helped to bring attention to the issue of gender inequality in sports.

4. The first subway in New York City was opened to the public on September 27, 1904: The Interborough Rapid Transit Company (IRT) opened its first subway line, which ran from City Hall to 145th Street in Harlem, and carried over 150,000 passengers on its first day.

5. The famous 'Bloody Angle' shootout between the Westies and the Irish Mob took place in New York on September 27, 1985: The shootout, which took place on a street corner in Hell's Kitchen, resulted in the deaths of three people, and marked the beginning of the end for the Westies gang.