In Harry Potter and the Half Blood Prince, Dumbledore leads Harry in his memories to Tom Riddle's orphanage. After having persuaded Tom, Dumbledore gives him some money, and Tom tells Dumbledore that he will find his way to Leaky Cauldron on his own. And he does.
Is there any clue that how a 10 year old boy who didn't have any knowledge about the magical world, could find the Leaky Cauldron on his own?