The New Castle of Manzanares El Real is one of the absolute best day trips from Madrid, especially if you combine it with a hike among the waterfalls and rock formations of the nearby La Pedriza area. The castle itself dates back to the 15th century and was built by the Mendozas, one of the richest and most influential families in early Castile around the time of the reign of the Catholic Kings, Ferdinand and Isabella.
What stands out most about the castle is its amazing state of preservation (it was apparently restored in the early 20th century) and the decorative granite balls which circle the turrets and give the castle something of a fairy-tale look. Inside there is a small and underwhelming museum, but the €3.00 entrance fee is more than worth it just to visit the rooftop gallery with its decorative Gothic windows and amazing views of the Sierra de Guadarrama mountains, the Santillana Reservoir, and the city of Manzanares El Real itself.
In the highest part of Chinchon stands the Castle of the Counts. The Catholic Monarchs granted Cabreja the extensive manor in the south of the province of Madrid, centred on the town of Chinchon. It is likely that, following the custom, the new lords built a castle as a residence and to flaunt their power. At the top of the entrance door you can see the crest of the Counts of Chinchon. The castle was besieged and subject to other military occupations that left it in deplorable conditions and although it was repaired and even rebuilt, the Counts of Chinchon stopped living there in the 18th century. Today it is privately owned by the Counts of Chinchon and the inside cannot be visited. It appears that the current castle is the second building that occupies the site. In the 19th and 20th centuries it was used as a farmhouse and liquor factory (Chinchón aniseed). The town of Chinchon is at one of the highest points of the plateau between the rivers Tajo and Tajuña. From the site of the castle there's a great view of the valley and the village, and in the distance we see the towers of Madrid.
The defensive of Buitrago del Lozoya is made up of the Alcazar castle and the walled, both declared national monuments in the year1931. Its origins date back to the Moorish period, so that the style in which it was constructed is the neo-Mudejar or Moorish style, as can be seen today, in spite of its restorations. Its interior was destroyed in a fire and isnt restored, and neither is its exterior. What they did do was construct a square of bulls in the weapon patio.