Hidden Histories: nuclear reactors, the Harold Stone and searching for shipwrecks

One of the roles of the Royal Commission on the Ancient and Historical Monuments of Wales (RCAHW) is to survey major industrial sites that are closing down. This way, the Commission can ensure that there are permanent records of ways of life in Wales that are changing forever.

In Hidden Histories tonight (Thursday 10 February, 7.30pm on BBC Two Wales), commission secretary Peter Wakelin, photographer Iain Wright and presenter Eddie Butler take a look at Trawsfynydd Nuclear Power Station in the heart of the Snowdonia National Park.

You can watch a preview clip from tonight's episode here.

The second destination for tonight's programme is Skomer Island, which has one of the finest archaeological landscapes in Britain.

The Harold Stone on Skomer Island (RCAHW)

Royal Commission investigators Toby Driver and Louise Barker examine how the relative isolation of the island from the mainland has preserved the remains of prehistoric settlements.

One reminder of prehistoric ritual and burial on the island is the Harold Stone, a 1.7 metre high standing stone. It is thought that the stone is a a Bronze Age monument, marking a burial (in a cremation urn) or an area of now buried ritual and funerary activity.

Barry Docks 1929 (RCAHW)

Staying shoreside, Eddie Butler and maritime officer Deanna Groom search for the wreck of a Bristol Channel pilot cutter.

The Royal Commission on the Ancient and Historical Monuments of Wales have created in-depth guides to each subject featured in tonight's programme. Read the guides on their website and view images relating to Hidden Histories on their Flickr photostream

Hidden Histories, Thursday 3 February, at 7.30pm on BBC Two Wales.