"He tapped the wall three times with the point of his umbrella. The brick he had touched quivered - it wriggled - in the middle, a small hole appeared - it grew wider and wider - a second later they were facing an archway large enough even for Hagrid, an archway onto a cobbled street whcih twisted and turned out of sight... The sun shone brightly on a stack of cauldrons outside the nearest shop... A low soft hooting came from a drak shop with a sign saying Eyelops Owl Emportium... 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..." - Sorceror's Stone
This cache is in a series symbolizing important places in the Harry Potter Universe. Find the others in the series HERE.