Visigothic basilica of Santa Ana Monument · Guadalix de la Sierra, Cuenca Alta del Manzanares, Madrid Image of Guadalix de la Sierra, not of the place itself. In October 2024 a team from the Autonomous University of Madrid identified at the site of Santa Ana the foundations of a Visigothic funerary basilica and around seventy graves dated to about the 7th century. Photo: Garcellor (CC BY-SA 4.0) What to see and do in Guadalix de la Sierra