Burger King isn’t an enigma. You order, hold the pickle and lettuce, and your special order doesn’t upset the people behind the counter if all goes to plan. Nevertheless, a mystery about a specific restaurant in the chain took up a Whopper-sized chunk of real estate in my brain: for the last quarter-century, I was convinced that the Burger King my grandparents took my brother and me to had a playground encapsulated by an inflatable dome!