Diagon Alley and the outside were like two entirely different worlds. The sudden change seemed to have transported Mr. and Mrs. Granger straight into the Middle Ages. Almost everyone coming and going was dressed as a wizard, and even the buildings lining the street looked thoroughly old-fashioned.
"The Wizarding World only uses three currencies: Galleons, Sickles, and Knuts. We've just passed Madam Malkin's Robes for All Occasions, the wand shop, and other shops selling supplies for new students. Now we're going to Gringotts to exchange some money. I'm sorry, Miss Granger, but after Gringotts, I'll have to go and guide the other young witches and wizards."
As Professor McGonagall led the Granger family around Diagon Alley, she explained many of its shops to them, including the clothing shops, wand shop, magical apothecaries, Flourish and Blotts, Gringotts, and so on.
After they reached Gringotts, Professor McGonagall apologized to Mr. and Mrs. Granger and left. She had to bring seven young witches and wizards from Muggle families to Diagon Alley that day, and her schedule was rather tight, so she could no longer accompany them after introducing the shops along the way.
Still, Diagon Alley was quite safe. People from the Ministry of Magic sometimes came to stroll around as well. As long as they did not stray into Knockturn Alley, Muggles would not encounter any danger while browsing Diagon Alley.
After entering Gringotts, Mr. and Mrs. Granger were startled by the goblins coming and going. It was their first time seeing beings other than humans, and this visit to Diagon Alley had certainly opened their eyes.
Then Hermione Granger led Mr. and Mrs. Granger to a service counter and handed her Hogwarts acceptance letter to the goblin.
After checking the letter, the goblin narrowed his long, slender eyes and told Hermione