Falkirk Wheel(Falkirk, Scotland, 2001) The Falkirk Wheel is the world's only rotating boat lift. Its steel arms each hold a water-filled tank into which boats can sail. As the wheel rotates, so do the arms, raising and lowering the boats a distance of 25 meters. The wheel is very energy efficient, using about two kilowatt-hours to make a full rotation. That's about the same amount of energy needed to power a microwave for three minutes.