Pwll Du

The Pwll Du Tunnel was the longest horse-powered tramway tunnel to be built in Britain at 1,875 metres (6,152 ft) in length. It started in Blaenavon, Torfaen, Wales, and was originally a coal mine, running northward almost horizontally into a hillside. Later it was extended right through the hill and used to carry limestone from quarries at Pwll Du and Tyla to the ironworks at Blaenavon, and to carry pig iron from Blaenavon to the Garnddyrys Forge. The tramway was extended past Garnddyrys to Llanfoist Wharf on the Brecknock and Abergavenny Canal. The tramway from Pwll Du to the canal fell out of use when the railway came to Blaenavon and the Garnddyrys forge was closed in 1860, but the tunnel continued to be used to carry limestone to Blaenavon until 1926. It is now a scheduled monument and part of a UNESCO World Heritage Site.

Ogof Draenen (Welsh for "hawthorn cave") is, at 66 km (official figure; the true length of passage is still being revised upward, with a modern estimate of approximately 70 km), the longest cave system in Wales and the second longest in Great Britain behind the Three Counties System on the Cumbria/Lancashire/Yorkshire border.The cave was known only as a small entrance on a steep hillside until several years of digging broke through into major passage development in October 1994. It was then explored at unprecedented speed to become the longest known cave in Wales. Ogof Draenen contains a variety of spectacular decorations and some huge passages (the War of the Worlds section is probably the second largest cave passage in Britain). Its large size and occasional complexity make the cave a challenge for even experienced cavers. The cave is managed by the Pwll Du Cave Management Group.

The Abergavenny transmitting station was originally built by the IBA in 1969 as a relay for BBC and ITV VHF 405-line analogue television. It consists of a 46 m guyed lattice mast carrying the aerials at the top. This structure was built on a 440 m hill known as Gilwern Hill overlooking the towns of Gilwern and Abergavenny in Monmouthshire, South Wales. The band III VHF television feeds were provided off-air from St. Hilary and Wenvoe, both near Cardiff. In 1973 the site was enhanced to transmit UHF analogue colour television. The UHF television feed came via a two-hop route from Wenvoe, via the Ebbw Vale repeater. The 405-line VHF television service closed across the UK in 1985, but according to the BBC's and IBA's transmitter list and the BBC's internal "Eng. Inf." magazine, Abergavenny was due to close early - in the third quarter of 1982. Currently, the hill's transmitters provide UHF digital terrestrial TV, VHF FM radio and DAB digital radio. The transmission station is currently owned and operated by Arqiva. Freeview digital terrestrial TV was not available from this transmitter before the digital switchover process began at Wenvoe, with the first stage taking place on 31 March 2010. The second stage was completed on 27 April 2010.

Gilwern Hill is a 441 m high hill in the Brecon Beacons National Park, south of the village of Gilwern in Monmouthshire, Wales. It lies west of the Blorenge. The hill is a Site of Special Scientific Interest.

The Dyne Steel Incline was a steam-powered tramroad that carried tram loads of cast iron up and over the hill between the Blaenavon Ironworks and Pwll Du. From there the trams continued along Hill's Tramroad to the Garnddyrys Forge and on to the Llanfoist wharf. It operated from around 1850 to 1860.

Garnddyrys Forge was an iron foundry in Wales that operated from about 1817 to 1860 about 3 km (2 miles) north of Blaenavon in Wales, lying on a tramroad between Blaenavon and the Brecknock and Abergavenny Canal. At one time 450 people lived around the ironworks. It became isolated when the railway took a different route to Blaenavon, and was abandoned. Although little now is visible, it is archaeologically well-preserved.

Blaenavon Blues A.F.C. are a Welsh football club from the town of Blaenavon, Monmouthshire in south eastern Wales. Formed in 1947, they have played in the Welsh Football League. They currently play in the Ardal SE, the third tier of the Welsh football pyramid.

Garn-yr-erw is a village in south-eastern Wales, lying at the source of the Afon Llwyd north of Blaenavon and Pontypool, within the historic boundaries of Monmouthshire. The village lies at an altitude of approx 400 metres on the side of Gilwern Hill, Monmouthshire and is cited by the Ordnance Survey as the highest village in Wales.The village had a station on the Pontypool and Blaenavon Railway from 1913 until the line's closure in 1941.

Blaenavon Ironworks is a former industrial site which is now a museum in Blaenavon, Wales. The ironworks was of crucial importance in the development of the ability to use cheap, low quality, high sulphur iron ores worldwide. It was the site of the experiments by Sidney Gilchrist Thomas and his cousin Percy Gilchrist that led to "the basic steel process" or "Gilchrist–Thomas process". The ironworks is on the outskirts of Blaenavon, in the borough of Torfaen, within the Blaenavon Industrial Landscape, a World Heritage Site. The site is under the care of Cadw, the Welsh Government's historic environment service.

Gilwern Halt railway station was a station on the London and North Western Railway's Heads of the Valleys line near the village of Gilwern in the Welsh county of Brecknockshire.

Blaenavon Hospital (Welsh: Ysbyty Blaenafon) was a small community hospital located in Blaenavon, Wales. It was managed by the Aneurin Bevan University Health Board.

Clydach railway station was a station on the London and North Western Railway's Heads of the Valleys line near the village of Clydach in the Welsh county of Brecknockshire.