Being a contour canal, locks are in short supply on the Brecon & Abergavenny stretch of the Monmouthshire & Brecon Canal. And then at Llangynidr five come along, all at once. It's a beautiful spot, right in the heart of the Brecon Beacons National Park, and there's a pub, the Coach & Horses, by the bottom lock.
Nearby attractions include Talybont Reservoir, famous for its water-based sport activities, and the fascinating Tretower Court & Castle historic house (01874 730279) - which has a very good audio-guide. A few miles away to the west is Blaenavon (Tourist information: 01495 792615). In the 1860s this designated World Heritage Site was at the centre of the largest iron producing region in the world, using new techniques for smelting and rolling.
The remains of the blast furnaces and works can be seen and here also is the Big Pit Mining Museum (01495 790311), where you can go underground in a former coal mine. Blaenavon, as part of reinventing itself as a tourist destination, has recently opened a number of second-hand bookshops in its centre.