Gilwern Hill, Monmouthshire

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.

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 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.

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.

Pwll Du (meaning a black or dark pool or pit) was a village in Monmouthshire, Wales. It was declared a slum in 1960 and demolished in 1963. The main employment was provided by nearby limestone quarries and by the iron works in Blaenavon. The Pwll Du Tunnel from Blaenavon, once the longest horse-powered tramway in Britain, ended near the village. A pub and the former Welfare Hall, now a school's outdoor pursuits centre, are all that are left standing.

The Monmouthshire and Brecon Canal (Welsh: Camlas Sir Fynwy a Brycheiniog) is a small network of canals in South Wales. For most of its currently (2018) navigable 35-mile (56 km) length it runs through the Brecon Beacons National Park, and its present rural character and tranquillity belies its original purpose as an industrial corridor for coal and iron, which were brought to the canal by a network of tramways and/or railroads, many of which were built and owned by the canal company. The "Mon and Brec" was originally two independent canals – the Monmouthshire Canal from Newport to Pontymoile Basin (including the Crumlin Arm) and the Brecknock and Abergavenny Canal running from Pontymoile to Brecon. Both canals were abandoned in 1962, but the Brecknock and Abergavenny route and a small section of the Monmouthshire route have been reopened since 1970. Much of the rest of the original Monmouthshire Canal is the subject of a restoration plan, which includes the construction of a new marina at the Newport end of the canal.

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.

Clydach House, Llanelly, Monmouthshire is a house dating from 1693. Constructed as the home for the manager of an ironworks in the nearby Clydach Gorge, it remains a private residence and is a Grade II* listed building.

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.

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.

Smart's Bridge, Llanelly, Monmouthshire, is a cast-iron bridge situated in Clydach Gorge. Constructed in 1824, it gave access to the Clydach Ironworks, the most significant industrial enterprise in the gorge. The bridge was designated a Grade II* listed structure in 2000.

Llanwenarth House is a small country house, formerly a hotel, located off the B4246 road, west of Govilon and Llanfoist, just south of Abergavenny in the Usk valley of Monmouthshire, Wales. It was built in the late 16th century, although the drawing room and some of the furnishings are from the Georgian period.