A Visit to the Pontcysyllte Aquduct 

The Pontcysyllte Aqueduct is a navigable aqueduct that carries the Llangollen Canal over the valley of the River Dee in Wrexham County Borough in north-east Wales. Completed in 1805, it is the longest and highest aqueduct in Britain, and a World Heritage Site.
When the bridge was built it linked the villages of Froncysyllte, at the southern end of the bridge in the Cysyllte township of Llangollen parish (from where it takes its name), and Trevor at the northern end of the bridge in the Trefor Isaf township of Llangollen parish.
The name is in the Welsh language and means "Cysyllte Bridge". For most of its existence it was known as Pont y Cysyllte ("Bridge of Cysyllte").
I visited in late May of 2015.