On September 13, 1982, Grace Kelly suffered a stroke and drove off the road at this point with her daughter Stephanie in the car. The car tumbled down the hillside for 100 feet. Princess Grace died the next day, while Stephanie escaped without serious injury.
v good map, but the accident actually happened in the next curve, where the house and the gardens are.
However, this particular curve is also of significance as this is where the fanous picnic scen in "To catch a thief" took place!