There's a very special NHL game taking place right now. Once a year, two teams square off in an outdoor arena in the Winter Classic. This year, the New York Rangers and Philadelphia Flyers are squaring off in Citizens Bank Park in Philadelphia.

The third period is about to start, so if you're not busy, I highly recommend checking it out! PS: Below you'll find a really cool stop-motion video of the transformation from baseball stadium to hockey rink. Enjoy!