In June 2008, I made my second visit to Oporto.  J.K. Rowling taught English in Oporto for two years in the early 1990s, when she wrote the first few chapters of Harry Potter and the Philosopher's Stone, the first novel in the series. Oporto has since parlayed her stay into a cornerstone of its tourism industry. Livraria Lello & Irmão, the city’s stunning bookstore, claims to have inspired Hogwarts Grand Staircase. Due to its tenuous connection to the series, the bookstore has become one of the city’s most visited attractions, in such demand that visitors are required to purchase a €5 credit, which can be applied against a purchase. From what I saw, the bookstore derives most of its revenue from the breakage of unused credits.  The bookstore is located in the buffer zone of the Historic Centre of Oporto, Luiz I Bridge and Monastery of Serra do Pilar WHS.