A sad image of the empty mansion house of Cwm Elan in the Elan Valley with the rising waters of the Gareg-ddu reservoir very close to the front of the building. The poet Percy Bysshe Shelley had stayed at Cwm Elan in 1811, and the house was used by senior engineers during the lengthy construction project in the valley. Although this postcard picture from July 1904 suggests that the house remained intact, it was actually demolished before the site was flooded.