Blaenavon is a World Heritage Site lying within the historic boundaries of Monmouthshire. Blaenavon grew around an ironworks since1788. The steel-making and coal mining industries followed, boosting the town''s population to over 20,000 at one time, but since the ironworks closed in 1900 and the coal mine in 1980, the population has declined, and now consists mostly of older citizens.
Attractions in the town include the Big Pit National Coal Museum, Blaenavon Iron Works, the Pontypool and Blaenavon Railway, Blaenavon Male Voice Choir and many historical walks through Blaenavon''s mountains.
This location has also the world''s first railway viaduct. This had been built in 1790, to be used by horse-drawn wagons to carry coal from the mines. Despite being about 40 metres long and 10 metres high, within about 25 years of its construction it had completely disappeared.