diagon alley

Tapping just the right brick in the wall behind the Leaky Cauldron in London ("Three up...two across...") will reveal an archway which is a portal into Diagon Alley, a long cobbled street where is to be found a strange and exciting assortment of shops and restaurants. It is unquestionably the hub of commerce in the British wizarding world, with virtually every wizarding business stationed there. Consequently, the demand for space here is steep, and rent costs "loads of Galleons."