Best for history

Monmouthshire and Brecon Canal
Originally designed for the transport of barges laden with coal and limestone, the 32-mile (51km) ‘Mon and Brec’ is now devoted purely to pleasure. Sample one of the National Park’s key pieces of industrial heritage on the Talybont Valley and Brecon to Pencelli walks.
Craig-y-Nos Castle
Now a hotel, the neo-gothic Craig y Nos Castle was built in the 1840s on a spectacular spot beside the river Tawe. Its most famous resident was opera singer Adelina Patti, who lived there from 1878 until her death in 1919. Catch a glimpse while walking the Craig-y-Nos Circular.
Abergavenny Castle
Founded in the 11th century, this ruined castle is now home to Abergavenny Museum. Packed with artefacts from the market town’s long and varied history, it’s a fascinating stop off on the Abergavenny Riversidwalk.
Found on the walk to Cefn Llechid, the ancient enclosure of Llanilltud has ancient roots. It was a settlement during the Iron Age and later the site of St Illtud’s Church. The church is gone now, but weathered gravestones still stand in the former churchyard.
Bronze Age burial sites 
The mighty 886m summit of Pen y Fan has exerted a magnetic pull for millennia. Ascend the peak on the walk from Cwm Gwdi and you’ll find the remains of a burial cairn left by our Bronze Age ancestors. There’s a similar cairn on top of nearby Cribyn too.
Castell Dinas
At 450m above sea level, the ruined Castell Dinas is reputed to be the highest castle in the UK. Stop off here while walking the Flying high from Talgarth route for awesome views in all directions.