Le Mur tombé du ciel | The Wall Fallen from the Sky in Nantes, Loire-Atlantique (44)

Looked at from one angle, this bizarre wall appears to be a remnant from an old period, although it is in fact an art exibit by Jean-Luc Courcoult created in 2011. It's a great pity it's been vandalised to such an extent though. A map of the features and characters (the vast majority of which are associated with Nantes) lists eighty-four.