Wikipedia:Today's second feature/February 18, 2006
The Falkirk Wheel is a rotating boat lift connecting the Forth and Clyde Canal with the Union Canal near Falkirk in central Scotland. It consists of two diametrically opposed caissons which rotate to lift boats between the two canals through a height of 35 metres. The wheel is always perfectly balanced and, despite its enormous mass, rotates through 180° in less than four minutes using just a few kilowatts.
Photo credit: SeanMack