Falkirk Wheel, Scotland, United Kingdom

The difference in the levels of the two canals at the wheel is 24 metres (79 ft), roughly equivalent to the height of an eight-storey building. The Union Canal, however, is 11m higher than the aqueduct which meets the wheel, and boats must pass through a pair of locks to descend from this canal onto the aqueduct at the top of the wheel. The aqueduct could not have been positioned higher due to conflicts with the historically important Antonine Wall.
The structure is located near the Rough Castle Fort and the closest village is Tamfourhill. On 24 May 2002, Queen Elizabeth II opened the Falkirk Wheel as part of her Golden Jubilee celebrations. The opening had been delayed by a month due to flooding caused by vandals who forced open the Wheel's gates.