In Horcajo de la Sierra, you can choose between routes through the town centers, riverside landscapes, and longer hikes in the highlands. One particularly useful distinction for planning is between a loop that includes both town centers and a shorter route through the town that is explicitly described as a one-way route. The hiking trails also offer different durations and elevation profiles.

Town centers and riverside paths

The municipal Ruta urbana por Horcajo y Aoslos is 3.5 kilometers long in total. This figure includes the routes through the town centers of Horcajo de la Sierra and Aoslos; the route is listed as a one-way route. The Horcajo-Aoslos loop along the route of the mills and Bellidas, by contrast, is 8 kilometers long and also passes through both town centers. Half of this loop runs in the shade of the riverside vegetation. If you want to get to know the towns, the shorter route offers a different perspective from the longer loop, with its sections by the water. Check trail conditions before setting out.

River, dehesa, and elevation gain

The Circular del Madarquillos loop runs alongside the river, through oak groves and riverside vegetation including ash, alder, and willow trees. You can discover old restored bridges along paths by the Río Madarquillos. Another way to explore the landscape is the La reguera y la dehesa de Horcajo route: it starts in Horcajo de la Sierra, is 6 kilometers long, and is listed as taking around 1 hour and 35 minutes, with 172 meters of elevation gain and a difficulty rating of 2 out of 5. The route passes through a well-preserved dehesa with Pyrenean oaks. This landscape was traditionally used as pastureland and to provide the town with firewood sustainably.

The challenging Alto de la Pinilla loop has a very different profile. It is 16 kilometers long, has an elevation gain of about 700 meters, and leads to Alto de la Pinilla at 1,879 meters. One of six Civil War positions intended to protect the Somosierra Pass is located there. The figures for distance, duration, and elevation gain help you compare the routes; check conditions and access before setting out.

Church, fountain, and rural heritage

The Iglesia de San Pedro in Cathedra is a Gothic church dating from the 15th century. Its Retablo Mayor dates from the late 15th or early 16th century and is attributed to Juan González Becerril and Pedro Berruguete. Another historical detail can be found at the Fuente antigua, considered the oldest fountain in Horcajo de la Sierra. The year above its spout is given as either 1855 or 1899. For many years, the fountain was the town's main water source, at least until the old water reservoir was built in 1957.

The Reguera de Horcajo-Madarcos is also part of the built heritage: this municipal water channel is about 13.5 kilometers long and is considered the town's oldest surviving structure. The municipality of Horcajo de la Sierra-Aoslos also has low buildings made of rustic stone masonry, originating as former livestock shelters and accommodation for shepherds. Homes stand alongside old hay barns, stables, and other livestock shelters. The bridge known as Puente Antiguo spans the Río Madarquillos on the old Camino Real and forms part of the Cañada Real Segoviana.

Landscape, events, and getting there

Bellidas has been practically abandoned since the 17th century; some of the remaining ruins are overgrown with vegetation. The municipality is also home to the La Alberca y La Tejera recreation area, set in a natural landscape of Pyrenean oak forests, mountain streams, and the Río Madarquillos. Check current access conditions before visiting. Festivals in honor of San Roque are celebrated in Horcajo de la Sierra on August 16; the specific program may vary from year to year.

If you are traveling from Madrid, the route described follows the N-I toward Burgos: you can take the Aoslos-La Acebeda exit at kilometer 83, or turn off for Horcajo de la Sierra at kilometer 85. An interpretive route between Horcajo de la Sierra and Aoslos follows the old road from Montejo de la Sierra to Buitrago del Lozoya, crosses the Río Madarquillos at the old bridge, and leads to the Poza de las Yeguas. If you would like to take this route with a guide, confirm availability with the local tourist office.

Discover more destinations: Aoslos, Horcajuelo de la Sierra, Robledo de Chavela, Villamanrique de Tajo, Casarrubuelos, El Gasco, Brea de Tajo, Villalbilla.

For the broader travel overview: Madrid.