There are several interesting examples of canal engineering in the area
Carreghofa locks, on the Montgomery Canal, are about a mile and a half from Glen Helen Holiday Cottages -- walking along the tow path. Also accessible by car.
A little further finds the canal aqueduct and road bridge over the River Vyrnwy.
A short drive brings you to the aqueduct and viaduct at Chirk. Photo from Oswestry tourism brochure