As Harry Potter and Ronald Weasley go through the barrier (they are walking because they are scared)they are in kings cross station, it is said that it feels like teleporting when you go through (some say swimming as well) on the other side they see the Hogwarts Express which leads them to Hogwarts. The awed castle they will be lead to will teach them. The thing is, most people don't know how it feels like to walk through that mysterious wall because they aren't wizards, otherwise everyone would know that odd feeling that comes when you walk through the barrier.