Big Pit is a real coal mine and one of Britain's leading mining museums. Go 300 feet underground with your Guide and see what life was like for the thousands of men who worked at the coal face. Enjoy an audio-visual experience telling the story of how the Welsh mining industry evolved. See how the life and work of a miner has changed from 1850 to 2000. Learning about the geology and uses of coal, mining disasters and rescue, and get a closer look at some mining memorabilia. View historic buildings and enjoy Blaenavon’s Industrial Landscape.
Big Pit is on the side of a steep hill and on a number of different levels and although there are ramps provided they are quite long and the climb can be arduous. The walking surface both above and below ground is typical of an industrial site. Please wear warm clothing and sensible footwear. The floor can be uneven or slippery in places and there are numerous steps to negotiate. Underground, there are one or two places where you will need to bend to avoid bumping your head. Staff will fit you with a helmet, lamp and belt before you go underground and visitors will be required to walk a distance of 700 metres wearing the safety equipment which weighs 5 kg. Children must be at least 1 metre in height for the underground tour, and each child must carry their own equipment. Children under 16 must be accompanied by an adult at all times.

https://museum.wales/bigpit/

After the underground tour, (or instead of) you can optionally take a trip on the Blaenavon Heritage Railway and still take the coach back to Cardiff. Please bear in mind you probably won’t have time to look around all of the above ground exhibits. See the separate activity information regarding Blaenavon Heritage Railway, but book your ticket here.

Basic price includes return coach travel (the coach will leave promptly at 9:30 and should get back by 17:00). The underground tour of the Big Pit and tickets for the Blaenavon Heritage Railway are extra.