Arthur Conan Doyle's legendary novels featured many London locations.
And with the BBC's Sherlock Holmes series and the 2009 and 2011 movies starring Robert Downey Jr and Jude Law, there's never been a better time to investigate the world of Sherlock Holmes.
Created by Scottish author and physician Sir Arthur Conan Doyle in 1887, Sherlock Holmes has featured in more films than any other literary character.
Doyle's famous detective has been played by 75 actors in more than 200 films, as well as appearing in four novels and 46 short stories.
Any Sherlock Holmes pilgrimage should start with a visit to Baker Street. Take the Marylebone exit to come face-to-face with a nine-foot bronze statue of the great detective. Keep an eye open for Sherlock Holmes look-a-likes near the station too!
It might take a bit of detective work to find the famous 221b Baker Street address where Sherlock Holmes lived and worked – it's actually located between 237 and 241 Baker Street!
Here, you'll find The Sherlock Holmes Museum, which has recreated his famous study as described in the books. You can also take a peek into Dr Watson's bedroom and look at his belongings and handwritten notes from the great detective. Please note: You should buy tickets from the shop before joining the queue to get in, and at busy times, there can be a long wait.
Be sure to take a look at 2 Devonshire Place, where Sherlock Holmes author Sir Arthur Conan Doyle's medical practice was located.
While you're in the area, pay a visit to nearby Madame Tussauds, which is home to a realistic wax figure of Robert Downey Jr as Sherlock Holmes. As well as seeing the replica Robert Downey Jr in full Sherlock Holmes costume, you can play with the interactive exhibits in his study.
Hop back on the Tube to Charing Cross, and take a short walk to The Sherlock Holmes pub. This is the place where Holmes tracked down Francis Hay Moulton in The Noble Bachelors. Inside you'll find another replica of Holmes' study, as well as a huge amount of memorabilia, including Dr Watson's old service revolver and a collection of television and film stills.
Tuck into a delicious detective-themed lunch in the restaurant at The Sherlock Holmes. How about A Case of Identity (chicken liver pate) followed by Dr Watson's favourite, Cumberland sausages?
Sherlock Holmes and Dr Watson travelled all over London as they pursued clues and criminals, and many of the capital's famous locations feature in the novels.
Not far from the Royal Opera House is the Freemasons Hall, a Grade II listed building which is used in the new Sherlock Holmes film. Freemasons Hall is the home of Freemasonry, one of the world's oldest secular fraternal societies.
You could also continue to Bloomsbury to see the spectacular British Museum, often visited by Holmes for his research – and an unmissable London icon.
From here, hop onto the Tube again and head to St Paul's Cathedral, where key scenes were shot for the 2009 Sherlock Holmes movie.
Stroll back to The Strand for dinner at Sherlock Holmes' favourite restaurant, Simpson's-in-the-Strand. The restaurant serves traditional English food, including beef carved at your table, and you can really get a feel for Holmes' London here.
If you fancy a drink or two, end the night at The Punch Bowl in Mayfair. Although not a Sherlock Holmes haunt, the cast of the Sherlock Holmes movie frequented this pub after filming, along with director Guy Ritchie (who also owns the pub). A great place for celebrity spotting!
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Sherlock Holmes, assisted by Film London.