Pontcysyllte Aqueduct and Canal in north-eastern Wales was awarded UNESCO status at the 33rd session of the World Heritage Committee held in Seville, Spain, last week.
Thomas Telford's pioneering engineering achievement of the Industrial Revolution is the nation's 28th UNESCO site.
A further 10 cultural sites were added to the World Heritage List, including Stoclet House in Belgium, the Ruins of Loropéni in Burkina Faso and Mount Wutai in China.
The Wadden Sea in Germany/The Netherlands and the Dolomites in Italy were acknowledged for their natural heritage status, whereas Dresden Elbe Valley in Germany was removed from the overall list of 890 properties.
