Changing Valley

Lake Vyrnwy.
Its stone-built dam, built in the 1880s, was the first of its kind in the world.
It was built for the purpose of supplying Liverpool and Merseyside with fresh water.
It flooded the head of the Vyrnwy Valley and submerged the small village of Llanwddyn.

[@Brenig102]

Nice video, and lovely commentary!