O Aqueduto Secreto de Campo de Ourique

This guided tour offers a rare chance to explore one of the water transport galleries of the Águas Livres aqueduct system. The visit begins with an iconic crossing over the Vale de Alcântara, leading participants to the Campo de Ourique reservoir.

Along the way, the mysterious route includes an underground walk through the interior of the Duarte Pacheco viaduct in Lisbon. It's a unique opportunity to discover hidden infrastructure beneath the city, blending history, engineering, and urban exploration.