Why is the Leaky Cauldron¹ famous?
‘This is it,’ said Hagrid, coming to a halt, ‘the Leaky Cauldron. It’s a famous place.’
For a famous place, it was very dark and shabby.
Philosopher's Stone - pages 53-54 - Bloomsbury - chapter 5, Diagon Alley
At first I thought perhaps the Leaky Cauldron was famous because it is so old, but then I thought a more fitting word in those circumstances would be "historical". "Famous" implies that something of great importance happened at the Leaky Cauldron, an incident of sorts. Is there anything in canon that explains why the Leaky Cauldron is famous?
★ I'm looking for an answer based in canon (the Harry Potter novels and three supplemental books, any interviews with J.K. Rowling, or information from Pottermore) and do not prefer an answer from the HP Wikia or Wikipedia.
¹Although it should be obvious, I will pre-emptively clarify that I am asking about the pub the Leaky Cauldron in the Harry Potter novels and not The Leaky Cauldron the website.