Leadenhall Market is an ornate Victorian covered market in the City of London. The current cast‑iron and glass structure was designed by Sir Horace Jones in 1881, though a market has operated here since the 14th century. The roof's coloured panels, wrought‑iron arches and cobbled walkways create an atmosphere reminiscent of a bygone era. Today the market hosts luxury shops, pubs and restaurants and acts as a public thoroughfare between Gracechurch Street and Lime Street. Its eclectic architecture makes it a popular filming location and a real‑world Diagon Alley. In *Harry Potter and the Philosopher's Stone*, Leadenhall Market stands in for Diagon Alley. Hagrid leads Harry through the market's arcade and down Bull's Head Passage, where a blue door at No. 42 serves as the entrance to the Leaky Cauldron. In reality this door belongs to an optician's shop, but the film transformed it into the doorway to the wizarding pub. The market's cobbled paths and ornate roof provide the backdrop for Harry's first steps into the magical world.

These narrow London lanes near Cannon Street embody centuries of city life, where cobbles, doorways, and hidden courtyards weave a palpable sense of history into the present. Their weathered textures and tight turns create an atmosphere of secrecy and urgency, making them a magnet for productions seeking an authentic urban vibe. The alleyways have become a favored backdrop for moody, character-driven moments and chase sequences that pulse with the rhythm of the City. Walking this corridor, you feel the hush before a dramatic reveal, as footsteps echo along the stone walls and lanterns cast long, cinematic shadows.

Borough Market, London's oldest food market, has traded for more than 900 years. Originally held in the middle of Borough High Street, the market caused such congestion that an Act of Parliament in 1756 moved it off the road. Today its maze of stalls sits beneath railway arches, offering artisan produce and street food. The quiet corner at 7 Stoney Street houses a small shopfront that became a film landmark—the exterior of the Leaky Cauldron in the third Harry Potter film. Visitors browse under wrought‑iron canopies, passing florists, cheesemongers and bakers in a space that feels both timeless and vibrant. In *Harry Potter and the Prisoner of Azkaban*, the filmmakers relocated the Leaky Cauldron entrance from Leadenhall Market to Borough Market. After a wild ride on the Knight Bus, Harry disembarks outside a flower shop at 7 Stoney Street and walks through its door into the Leaky Cauldron. In the same sequence the Knight Bus screeches to a halt and prangs a car before stopping outside the pub and The Third Hand Bookstore. Only the exterior was filmed here; interior scenes were shot on a studio set.