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?
Long before Joanna Lumley went all AbFab over the idea of a garden bridge across the Thames, there was an earlier, and fortunately, never built plan for a garden bridge.
Long before the Isle of Dogs was filled with tower blocks, it was seen as a cheap plot of derelict land, and ideal for sticking a major road bypass through.
A marvel of the industrial age, a mighty iron footbridge permitting safe and quick passage for pedestrians over congested and dirty streets. At least, that was the plan.
Over the years there have been many attempts to build a bridge across the Thames near St Paul's Cathedral, and this is the story of one of them.
London's famous three - Piccadilly Circus, Oxford Circus, Regent's Circus. Hang on, Regent's Circus? Yes, the huge circle at the top of Regent Street lined with expensive houses. Haven't you seen it?