Hermione's parents managed to enter diagon alley, most likely through the leaky cauldron Yes, because hermione's parents can get to diagon alley. Though nondescript, this alley is one of the primary gateways in britain from the muggle world into the wizarding world It has rarely been mentioned since harry’s first time through, but presumably wizards need to pass through it any time they travel between the leaky cauldron and the rest of diagon alley. If they could see the remains of the potters’ home, then we’re assured that the fidelius charm had been broken However, if they couldn’t, we’ve got little to go on
It’s visible to any wizard. All of these people are muggles, and all of them are wrong The oldest pub in london, as any wizard will tell you, is the leaky cauldron on charing cross road.
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