My apologies if this has been posted before, but a forum search came up with nothing but a vague reference in 2010. So.
An astonishing (to my mind) and enormous paper model of Prague made by Antonin Langweil between 1826-1837. I make that eleven years; longer than I've ever spent on a model. There are pictures, videos and audio in the Gallery section:
LANGWEIL'S MODEL of PRAGUE
Have Fun...