Lombard Street, San Francisco from the bottom. It's a one-lane hair-pin road through a private neighborhood. Scary and make sure your brakes are good! Ours were smokin' by the time we reached the bottom!
Down one of the streets in Disney's Hollywood Studios (at the time it was MGM Studios) it will seem like walking towards San Francisco. It does look so realistic but the road is only 2 metres feet) deep.