I pulled into parking place by turning left from the roadway at a private home after braking and putting my car in park my car self-accelerated and sped though a chain link fence and over a one step high step on just left side of vehicle and then into a shed! The impact left the front doors crunched in so my passenger and I had to crawl through the back of the car to exit. Luckily the air bags did not deploy! The chain link fence and the shed were destroyed. The contents of the shed were pushed to the back of the shed up against a stone wall. Once the car stopped all I had to do was turn off the ignition.