The blurb on the Alternative London Tour's website says it promises to help you "discover the London you won't find in the guide books."
The tour's two-hour walks concentrate on London's fascinating East End, and more often than not include visits to Spitalfields, Banglatown and Shoreditch.
Street art is high on its agenda, which means the precise walking route can change from day to day, after all, you never know where the next Banksy might pop up.
The knowledgeable and enthusiastic Alternative London Tour guides will show you the work of some 50 artists during the walk, at the same time offering background and context to what it is you're looking at.
The guides will also uncover the rich social and political history of the East End, and take a look at how the area is faring today.
They'll also look at how it's changing today, and offer an opinion on how it might look in the future.
The tour usually begins near Liverpool Street station and ends close to Old Street tube station. It's popular with tourists and Londoners alike, so with places being limited, you might have to book well in advance if you want to join.
Walks take place every Tuesday, Thursday and Saturday at midday, and every Tuesday, Wednesday and Thursday at 7pm.
The people behind the Alternative London Tour don't charge for their walks - these are people passionate about the East End and are simply keen to share their love of London with like-minded people, while revealing parts of the city that you never even knew existed.