Imagine if you will of streets lined with decorative arcades that protected Victorians from the weather and above their heads, a marvel of the age - a silent railway without steam.
A scheme once proposed replacing five railway stations in central London with one giant terminus in Southwark.
There should be a major junction under Oxford Circus acting as the centre point of a large double-loop tube line, had plans shown off in 1988 gone ahead.
Just over 200 years ago, a plan was presented to Parliament that could have seen a large section of the City between London Bridge and the Tower of London turned into a series of large docks.
Although Heathrow Airport has a couple of railway links to central London, they weren't necessarily the ones that we could have ended up with.
In the inter-war years, there was a war between two rival camps for urban planning, the high-density housing with lots of communal space, or low-density with lots of private space.
The South London trams snake around the region offering a convenient east-west link, but once could have also been extended to just outside the former Crystal Palace.
In the 1960s, King's Cross almost became more famous for a massive glass tower than it was for its nocturnal delights in the seedy bars.
Forget garden bridges and wobbly bridges and tower bridges, what we really need in London is a 7-story high crystal bridge!
When you're a museum in need of some extra space, and maybe a more visible presence in the area, what could be better than a massive and very tall glass tower on your doorstep?