The Myth
the Leaky Cauldron from Chris Columbus's 2001 Harry Potter and the Philosopher's Stone: a pub that is also a door between worlds, which is a great deal to ask of a doorway.
The entrance Hagrid steers Harry through is real, and it is in Bull's Head Passage, a side alley off Leadenhall Market deep in the Square Mile. The unit was empty when the crew painted the door blue. It is the Glass House Opticians now, and that blue is still the only thing in the passage that isn't Victorian red and green. Nobody drinks here. People queue to photograph a door.
PINtPOINT pins it because the whole premise of the Leaky Cauldron is that you have to already know it's there. A pub that never was, at the one address in London that most looks like it should be.
Ghost Hunter mode reveals 500+ closed pubs across the PINtPOINT radar — and, occasionally, the ones that never existed at all. Fiction leaves its own shape on a city.