Official Portal of Tourism. Junta de Castilla y Leon

An aqueduct dating back to the 1st century CE, and the days of the Flavian dynasty and the emperors Nerva or Trajan. The 166 arches of granite from the Guadarrama mountain range are made up of unmortared blocks based on an ingenious balance of forces. It is 15 kilometres long, of which one kilometre is a series of arches and the rest underground canals.

Restored in the 15th and 19th centuries, the first section goes from el Riofrío or La Acebeda to the first silt basin. It is made of granite and between its stones there is nothing holding it together apart from the perfect use of the pressure and weight of the stones. At its highest point in the Plaza del Azoguejo it is 28 metres high.

There are two vaulted niches that pagan gods used to occupy. They were substituted by images of Saint Sebastian and the Virgin Mary.

Has been declared a Civil Engineering International Artistic Historical Monument by the ASCE (American Society of Civil Engineers) in 1999.