Fleckeby may be the key

Significant facts:
Type 'Cannizaro Park London' into Google and there are 12,500 hits.
Type 'The Augarten Park Vienna' into Google and there are 22,600 hits.
Divide 22,600 by 12,500: The Augarten divided by Cannizaro, and it is equal to 1.808.
1.808 is therefore a significant number - in the same vein as pi.
I shall call 1.808 'ca' (this stands for Cannizaro/Augarten).
If one puts 1.808 (ca) into Wikipedia it equates to the population percentile of Fleckeby Germany.
Wikipedia continues:
'Fleckeby is a municipality in the district of Rendsburg-Eckernförde, in Schleswig-Holstein, Germany. Fleckeby is east of the municipality of Güby, but north of Hummelfeld.'

The solution must be somewhere in Fleckeby: a museum, a gallery, written in a shop window, in a musty library or city archive, scratched into a dry wall or written out in pebbles. If you live or know someone in Fleckeby please contact them. It may be necessary to get an agent in Fleckeby.