And it's the perfect example of an unusual architectural style called Expressionism...
This is about architecture — but the story begins with art.
The Scream by Edvard Munch (of which he made several versions) is probably the most famous example of Expressionism in art.
Expressionism was about painting how the world *felt* rather than how it *looked*.
Hence Expressionist art — which first appeared in the 1890s and really came to life in the 1920s — was defined by unnaturally vivid colours and unrealistic shapes.
Everything is dramatic, restless, and colourful.
Art as pure emotion rather than outward appearance.
Here's what happened, hour by hour, as told by somebody who witnessed it...
(The date is actually contested and some think it was 24th October, but more on that later...)
Mount Vesuvius is a volcano on the south-west coast of Italy, overlooking the Bay of Naples.
This was a thriving place in Roman times, surrounded by bustling towns and seaside villas.
The year is 79 AD.
A young man called Pliny the Younger is in the area, at a town called Misenum to the west of Vesuvius, with his mother and his uncle, known as Pliny the Elder.
He was only 18 years old then, but would go on to have a long career in Roman politics.