How do I unsubscribe from a calendar subscription?

I just upgraded to Mavericks. My calendar look changed. I thought it would be cool to to have moon phases and weather show up, so I subscribed. But it doesn't show up how I like (way too much moon info) and the weather is in celsius.

I thought they would have some kind of display options, but they don't. I can un-check them so they don't show up, but I can't figure out how to completely unsubscribe from them.