This category appeared on today's Jeopardy. I may not have the exact wording, but close enough.
$200: An optical Illusion or a Las Vegas Hotel
$400: An Arthurian Legend, pulled from a stone or given to him by the Lady of the Lake or a Las Vegas Hotel
$600: The European playground pictured here or a Las Vegas Hotel
$800: The bird, Phoenicopteridae, or a Las Vegas Hotel
$1000: Last answer in the category, not shown, because time ran out.