Why do doors in different countries open in different directions? At least in USA doors open towards the inside, whereas in Finland they open to the outside? Common sense suggests that doors that open outside are a lot harder to kick open, since it would be the frame of the door that absorbs the hit, in addition to any locks and bolts that might be present. Whereas door that open to the inside would have to rely on the bolts alone. Now, that may or may not be relevant to everyday-situations but still. Is there any reason, historical or otherwise why doors open the way they do?