UK tourism chiefs have themed their latest travel campaign around the film, which is based on the famous books by Sir Arthur Conan Doyle and opens in cinemas on Boxing Day.
On online movie map invites tourists to discover Sherlock Holmes' Britain and provides a round-up of the famous locations that feature in the film, including St Paul's Cathedral, the Houses of Parliament, Manchester town hall, Liverpool Docks and the Old Royal Naval College at Greenwich, south London.
The website, which also features footage from the film and information about the Sherlock Holmes Museum at 221B Baker Street in London, encourages visitors to plan short breaks to London, Liverpool, Manchester and Edinburgh with a Sherlock Holmes theme.
The film's director Guy Ritchie said: "Sherlock Holmes is an iconic British character and bringing our story to life on the streets of London, Liverpool and Manchester was part of the fun of making this film.
"Given the 150th anniversary of Sir Arthur Conan Doyle's birth this year, I'm excited to unleash our version of Sherlock Holmes to audiences in the UK and around the world."
Downey Jr said: "Sherlock Holmes has great pride in being English. London is an incredibly fascinating city and the centre of the world at the time our film takes place. Holmes knows every inch of it and feels it's his city. It was great fun filming throughout Britain."
Visit www.visitbritain.com/sherlockholmes and while you're at it you may want to check out EuropebyAir for Red Tag sales to Europe.
