“Harry wished he had eight more eyes… There were shops selling robes, shops selling telescopes and strange silver instruments Harry had never seen before, windows stacked with barrels of bat spleens and eels’ eyes, tottering piles of spell books, quills, and rolls of parchment, potion bottles, globes of the moon […] ”
—Description of Diagon Alley.
Diagon Alley is a cobbled wizarding alley and shopping area located in London, England behind a pub called the Leaky Cauldron.
Inside the alley is an assortment of restaurants, shops, and other sights. All items on the Hogwarts supply list can be bought at Diagon Alley. The alley is completely hidden from the Muggle world which is right outside of its boundaries. It is very large in area and essentially the centre of wizarding London.