We were holidaying fairly near Llangollen last month and saw the sign to Horseshoe Falls en route elsewhere. We detoured for a 'quick look' and ended up spending most of the day in the area with the original plan being kicked in to touch.
The falls are artificial and are actually a man made weir designed to extract water from the River Dee and divert it in to a canal. The canal is the Shropshire Union canal and this is where it starts. The weir was co - designed by the engineer Thomas Telford whose role in building the canal was accepted despite the fact that he had no previous experience!
A little further down the canal is the Pontcysyllte Aqueduct which was also a Thomas Telford design. It carries an early navigable section of the canal and gets quite busy as it is single file traffic. The whole area is recognised as a world heritage site.
We crossed over the viaduct, which is a tight squeeze with two way pedestrian traffic and came across a monument to the local limestone mining industry of days gone by.