All Hotspots are shown on the maps like this:
Hotspot 51
In Mayfair, a tree is found standing,
With mist like a spirit expanding.
By The Connaught’s grand door,
From the glass-
A ghostly white cloud is commanding.
Though "steam" is what many assume,
There’s no heat to create all that plume.
Just nozzles and pressure,
For the traveller's pleasure,
To clear out the city's dark gloom.
Every quarter an hour, the "Silence"
Takes leave of the traffic and sirens.
With a Zen-
Of the atomized stuff,
It softens the Mayfair environs.