To get to know what happened on a given day back in history you can log into the BBC website and check out there "on this day" page. This website also has a function that allows you to select a date, month and the year of the time you want to view.
What happened 100 years ago today is a website that gives information on what happened one hundred years ago today. They offer clippings from newspapers about those events that have occurred in the past. You can find more information here: www.ask.com