October 2017 marks the 125th anniversary of the first Sherlock Holmes book, The Adventures of Sherlock Holmes – a collection of 12 short stories by Arthur Conan Doyle.

Whilst in more recent times, it’s been Benedict Cumberbatch (Aka a more neurotic Sherlock) and his trusty sidekick Doctor Watson (Played by Martin Freeman) that have stolen the headlines with their hit BBC television series, its Doyle’s iconic Britain and particularly the capital that’s where it all began.

From Holmes’ headquarters in London to doomy Devonshire quagmires, here’s the locations all visiting Sherlock fans must scrutinise for themselves.

Sherlock Holmes Britain - 221B Baker Street

221B Baker Street is Holmes’ base in Sir Arthur Conan Doyle’s stories, and all subsequent screen adaptations.

The address doesn’t actually exist but walk down busy Baker Street to number 237-41, and you’ll find the Sherlock Holmes Museum.

Inside is a recreation of the master detective’s disorderly study, filled with odd Victoriana, plus Dr Watson’s much-tidier quarters.

At Baker Street’s underground station there’s a three-metre tall Sherlock statue – deerstalker cap as standard – with which one can pose.

Just steps away is Madame Tussauds, where a waxwork figure of Sherlock star Benedict Cumberbatch is accompanied by a murder-mystery challenge in the basement.

The Sherlock Holmes Experience features period-style actors and a case for visitors to solve.

Sherlock Holmes Britain - St Bartholomew's Hospital

It’s at St Bartholomew’s Hospital in east London where Holmes first encounters Dr Watson.

The roof of ‘Barts’, as it is universally known, was later utilised by the BBC for the climax of Sherlock’s second series as the place where Holmes supposedly leaps to his death.

That promontory isn’t open to the public, but you can imitate Martin Freeman’s Watson by gazing up from ground-level.

Sherlock Holmes Britain - Pub

Back in central London, Benedict Cumberbatch and co used the townhouse at 187 North Gower Street to double as 221B Baker Street.

Many scenes were also shot inside the adjacent Speedy’s Sandwich Bar & Cafe, where you can enjoy breakfast.

For lunch, try the Sherlock Holmes Pub near Piccadilly Circus: Sunday roasts are served every day beside a life-size replica of Holmes’ office.

Sherlock Holmes Britain - Dartmoor

In 1901, Arthur Conan Doyle visited dramatic Dartmoor National Park in the south-western county of Devon, walking 16-18 miles per day to scout possible locations.

The result is his best-loved Holmes novel, The Hound of the Baskervilles, in which bleak bogs and jagged hills lend a haunting backdrop.

Sherlock Holmes Britain - Highland Cattle on Dartmoor

Unique Devon Tours runs guided day-trips to the key spots, including the real-life Grimpen Mire. The nearest station Torquay is three hours by train from London.

Sherlock Holmes Britain - Baskerville Hall

Baskerville Hall, meanwhile, is reckoned – not universally – to have been based on what’s now the beautiful Baskerville Hall Hotel in mid Wales.

Conan Doyle regularly stayed at the-then country house, and was supposedly regaled with a hound-based legend during one visit. The hall is a two-hour drive north from Cardiff.

Sherlock Holmes Britain - Baskerville Hall Interior

Conan Doyle was born in Scotland’s classical capital city, Edinburgh. A bronze Sherlock statue commemorates the childhood home on Picardy Place.

It was also at Surgeons’ Hall Museums where Conan Doyle met Joseph Bell, chief inspiration for Dr Watson.

Sherlock Holmes Britain - Portsmouth City Museum

At Britain’s southern edge is Portsmouth, 90 minutes by train from London Waterloo. Conan Doyle wrote his two inaugural Holmes novels here, while setting up a doctor’s practice on Elm Grove.

That building was sadly destroyed during World War II – a plaque marks the spot – but there’s plenty to see at Portsmouth Museum, where a bevy of books, photographs and memorabilia form part of the Arthur Conan Doyle Collection.

Sherlock Holmes Britain - Cardiff Castle

Wales’ capital, Cardiff, has more recent associations with Sherlock Holmes: it has been a main filming location for all four of the BBC’s series.

Cardiff Castle, which hosted a confrontation with Moriarty, has tours available, while you can also walk in Sherlock and Watson’s footsteps at the National Museum Cardiff, which is free to enter.

Sherlock Holmes Britain - Bristol Walking Tours

Another regular haunt for BBC’s cameras has been Bristol, 30 miles (50 kilometres) east across the Severn Estuary. The city’s constant cameos date back to the debut episode, when Holmes encounters Moriarty in Bristol South Swimming Pool.

It is in leafy Queen Square that Emilia Ricoletti (otherwise known as the Abominable Bride) shoots at passers-by, while Portland Square stages the bonfire from which Holmes and Mary retrieve Watson.

The Bristol Film Office’s walking trail covers a host of locations.

Which Sherlock Holmes location would you visit first? Tell us in the comments below.