Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

This 1920s Dutch barge is now a floating bookstore.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Hidden beneath the streets of London is a secret subway that only carried mail.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.