Cadw & National Trust places in Powys

Terraced ruins of a 19th-century lead and barytes mine below the Clywedog dam near Llanidloes, with crushing houses, ore bins and wheelpits labelled; free, open daylight hours, a small car park and ten-minute wooded path.

Thirteenth-century round keep on its motte beside the A479 near Talgarth, climbed by 87 steps for views of the Brecon Beacons; free, open daily, park in the lay-by across the road.

Llywelyn the Last's castle of 1273 above the Severn valley, built in defiance of Edward I and taken by Roger Mortimer in 1277; free, open daylight hours, five parking spaces and a steep 300-metre track up from the lane.

Henry III's castle of 1223 on a crag above Georgian Montgomery, with towers, deep ditches and wooden bridges, demolished in 1649; free, open daily, small on-site car park with EV chargers and far-reaching border views.

The Picards' great round tower and the Vaughans' 15th-century court with its feasting hall and recreated medieval garden, either side of the castle green at Tretower; free car park behind the barn visitor centre.

Consolidated gateways and towers of a large Roman cavalry fort of AD 75 in a sheep field on a working farm west of Brecon, dug by Mortimer Wheeler; free, 10am to 4pm, on foot down a 680-metre farm lane with no parking or signs.

Vast open moorland in the remote Cambrian Mountains, crossed by ancient drovers' roads.

Iconic peaks of Pen y Fan and Corn Du, the highest mountains in southern Britain.

The tallest waterfall in South Wales, a 90-foot drop into the wooded Graig Llech Gorge near Coelbren, reached by a steep woodland path of about a mile there and back from a free NT car park.