Near Guarda, Portugal you will find Covão do Conchos, a surreal looking spillway that is part of the Conchos Dam, which is part of the hydroelectric system of Serra da Estrela and gathers water from ribeira das Naves.

Built in 1955, the small dam diverts water from ribeira das Naves to Lagoa comprida dam through a 1519 m (4,984 ft) long tunnel. In this amazing aerial drone video we get up close and personal with Covão do Conchos.

If you think this spillway looks cool, be sure to check out our post on bell-mouth spillways with tons more pictures and examples from around the world!