London is obviously a very historic city/region, but naturally most vistors explore more-or-less only what's inside the Circle Line. While suburbia doesn't have as much to draw the average tourist, that doesn't mean their history is any less relevant or interesting, especially when it concerns the real lives of people, or places that have passed into pop-culture lore.
This is all that remains of Walthamstow Stadium - home to greyhound racing since the late 1920s - dog racing being so popular that at one point there were over 30 stadia in London alone. The track also hosted speedway and stock-car racing in its history but dogs were its main focus.
The iconic art-deco frontage was added in a refurb in 1932 and was such a notable presence that even after the rest of the stadium was demolished in the 2010s, this frontage was preserved. The site is supposedly being redevloped into housing, but this has proved controversial & the whole process is ongoing.
The stadium's presence led it to be used in many pop-culture references to East London - for example pop bands like Blur and East 17 used it in their media (it's the location of the pics on the former's Parklife album, for example). It's one of the main reasons why people have heard the name Walthamstow.
Have you ever seen greyhound racing?