Today is the 65th anniversary of D-Day, which will stand through the centuries as a major milestone in the history of freedom and its triumph over tyranny. Here's Google's special logo for the day:

It seems today is also the 25th anniversary of Tetris, a Soviet video game. I had never heard of Tetris, but apparently it is much more significant than the sacrifices made on Omaha Beach, at least from Google's point of view.
Wikipedia offers an On This Day feature on its main page. Here it is for today: