Long time ago (in the old client) you could watch random high elo games that were played. It was very cool in so many ways: learning something new gamewise, procrastinating a bit and just overall satisfying curiosity of high level games. Does anyone know will this feature be back? Or why it was removed in the first place?
Not entirely the same thing, but you can watch challenger games by going to the Ranked tab, filtering by challenger ladder, and clicking on the players with the "Spectator Eye" next to them. This symbol indicates they are in a game and can be spectated.