The maze at Hampton Court Castle, Herefordshire, has a tower at its centre from the top of which you can survey people wending their way (or not) towards you. It also has a tunnel that leads from the base of the tower to the garden beyond the perimeter of the maze. This means that, having navigated your way to the centre of the maze you have no need to find your way out: a feature that I've never come across before. But then I haven't experience of more than half a dozen mazes.
photo © T. Boughen Camera: Sony DSC-RX100