Which Widebody Aircraft Have Dedicated Crew Rest Areas?

There are some areas on a widebody aircraft that are accessible only to the flight and cabin crews, where they can get some rest during a flight. Entry is prohibited to passengers, and you would barely know that they are there; they are so hidden away. Usually, these crew rest areas, or crew rest compartments as they are sometimes called, are behind a door that looks like a closet, but with steps leading to the rest area.