The Perseid Meteor Shower peaks this weekend.  According to EarthSky.org the best viewing should be tonight (Sun 8/11) around midnight and before dawn but also Monday and possibly Tuesday as well.  My understanding is that before sunrise is a pretty good time too.  [VIDEO]

According to Wikipedia we humans have been looking at the meteor shower for around 2000 years.  Here's a pretty well done time lapse video of the meteor show back in 2009.