InsaneJournal

The Leaky Cauldron is a popular wizarding pub in London. It is the entrance to Diagon Alley, and, indirectly Knockturn Alley. For much of the end of the 20th century, Tom was the landlord. At some point, Hannah Abbott became the landlady, moving in with her husband, Neville Longbottom.
A customer at the Leaky Cauldron.
SmonoccoAdded by Smonocco

It was built by Daisy Dodderidge, who was the first landlady. The Leaky Cauldron was built in 1500. She said it was, "to serve as a gateway between the non-wizarding world and Diagon Alley." It rented rooms, had a bar, several private parlour rooms, and a large dining room.

To Muggles, the pub appears to be a broken-down old shop front on Charing Cross Road. The rear of the pub, however, opens up onto a chilly courtyard and the entrance to Diagon Alley. To gain access, a witch or wizard tapped the bricks in the wall in a counter-clockwise order. A doorway to Diagon Alley then forms and rearranges itself back to the original wall after the person(s) walk through.