Fiat Multipla

(Photo by leylandbus)
This car definitely has a special story to tell, although it is your guess, which.
First registered in January 2001, taxes for it were only paid till December of the same year. So after just one year on the road, the owner parked it in his garden, where it has been standing until today.
My guess would be it had some kind of incident involving water that destroyed the engine and wasn't covered by warranty. That would still lead to the question why it wasn't parted and scrapped.
Another possibility could be the death of the owner and disunity between the beneficiaries.

However, the Multipla became famous after its release in 1999 because of its looks, which were considered extremely ugly by most people.
In 2006, the exterior was redesigned to look normal.
If the example above wouldn't have been left to rot, it would probably still look like this one:

(Photo by Dmentd)

Fiat 500

(Both pics by marvin 345)
The Fiat 500 was built more than 3 million times. Like every model produced in masses, some examples have not been cared for.
The car in the pictures is one of them. Without an engine or headlights it is sure to rot there forever or to be crushed.
Nevertheless, it is a small part of the big history of the Fiat 500.
As the successor to the famous Topolino, it was produced from 1957 till 1975 and was a big success. The example in the picture was produced before 1970.

The carreer of the 500 is not over yet. The current Fiat 500 has a retro design reminding of the old 500.
And in Japan, Duesen Bayern is building 500-"replicas" based on the Nissan Micra (called "Ritz"):