This is one of the old winch houses on the top of a quarry incline. Those huge winches were used to lower a full waggon and pull up an empty one. More info on the Dinorwich slate quarry can be found under Wikipedia Dinorwic Quarry
Wales (Cymru in the Welsh language) is part of the United Kingdom of Great Britain and Northern Ireland. The major cities are Cardiff, Swansea, Newport and Bangor. The city of St. Davids is the smallest city in the UK with a population around 2000. Wales itself has a population of around 3 million. The Welsh language is spoken by around 20% of the population.