Pontsticill Reservoir valve tower

Pontsticill Reservoir valve tower is a castle, fort or tower in Merthyr Tydfil, Wales. Perhaps the valve tower stood guard over water meant to quench the thirst of a growing town. Maybe its doors swung open only when the pipes ran dry, admitting men in rubber boots and oil-stained gloves. Imagine the reservoir breathing beneath the valley, its surface trembling at the least change in pressure, while the tower waited like a patient sentinel.