As far I remember I've seen two crashes... In the same place: the intersection in front of my grandparents house. The first one, I was a kid and I was looking the cars from the kitchen's window. A Renault Super Cinq was about to turn left, but the traffic light was just switched green so it was steady in the middle of the road waiting to turn. In the opposite direction a Fiat Tempra SW just started to go when another car (maybe a Mercedes-Benz W124, but I'm not sure) arrived behind the Renault quite fast and although it braked hard, hit the Renault pushing it against the Tempra. The poor R5 was totaled: rear and front completely destroyed, oil and other liquids everywhere, same thing for the Tempra: grille, headlights and bumper heavy damaged, but the Mercedes had just the plastic of an headlight broken and the bumper scratched! The following days I found on the side of the road the Tempra's Fiat badge of the grill.

The other one was 8-9 years ago; an old man on a bicycle was hit by a man in an Opel Zafira, but at low speed so no serious injuries although the old man fell from the bike and hit the ground with the head (in fact he was unconscious).

Always in the same intersection a lot of other accidents happened, according to my grandparents tales, the more impressive ones: in the early 90's a Renault 5 had lost control after a hump and collided with the gate and a piece of wall destroying them. A tow truck carring a broken-down minivan waiting at the red for turn right, was rear ended by a truck that pushed it against a light pole, then to the traffic light pole, some signals and even a electrical unit (causing a small blackout); both poles fell in my grandparents garden, luckly there wasn't none at the moment, but there were pieces of glass and plastic everywhere!
A Ford Ka made about 3-4 rollover after being hit by another car while merging on the main road, and many others!