Earth has been knocked about quite a bit by asteroid strikes during its long history. All of the planets in our solar system have been heavily bombarded at one time or another, just look at the Moon. Asteroid strikes still occur, just not as often or as dramatically in the past.
Nearly 170 terrestrial impact craters have been identified on Earth ranging from a few meters to 300km (186 miles) in diameter.
Check the video created by MBS that puts the size of some of these craters into perspective! Have a Blast!