We vacationed in Berlin last summer with two kids, and that place is famous for its fantastic playgrounds. It was rare to see the same designs repeated over and over as you do in other cities, and each playground was more or less unique.

As you say, stuff where you balance quite high up, but usually with a softer material on the ground than asphalt so that a fall isn't lethal. I never saw kids fall and hurt themselves, so I don't know what would happen if they fell from the maximum height, but they wouldn't die.