Human have always thrived on the idea of roaming free in the world, but there are many places in the world that are restricted for humans. Though there are many places in the world where we can go and access the knowledge available to us, there are few places on the earth even today that are restricted to humans as they are deemed dangerous or the power there don't want us to know what exactly happens there behind closed doors. Here are 11 such places in the world where no human can visit.