The streetscape of Londons historic square mile has been evolving for centuries, but the Citys busy commercial heart still boasts an extensive network of narrow passages and alleyways, secret squares and half-hidden courtyards. Most are ancient survivors dating back to medieval times or earlier, their colourful and evocative names recalling old taverns, trades and city traditions. Others commemorate individuals associated with the seemingly unstoppable rise which has seen the area around an old Roman wharf become the global financial powerhouse that London is today. Here are all the fascinating hidden features that Londons Square Mile has to offer the tourist of the seasoned Londoner.