I've just cycled 74km to the Falkirk Wheel and back, along the Forth & Clyde Canal. It took 2 hours on the way out, and about 1h40m on the return fuelled by Mars bar crispie cake from the Falkirk Wheel cafe. On the way back, I bumped into the Rt Hon Big Al Campbell near Bishopbriggs, having trouble with his road bike clogging up on the muddy towpath.
The Falkirk Wheel is the only rotating boat lift in the world, and links the Forth & Clyde Canal with the Union Canal. The Falkirk Wheel replaces a series of 11 locks which lifted or dropped boats a height of 25 metres. This would to take the best part of a day to negotiate, but now the trip takes around 15 minutes. The locks were closed back in the 1930s.