Sierra de Guadarrama
Madrid's granite backbone — Peñalara's glacial cirques, the boulder chaos of La Pedriza and the mountain school of a century of Spanish culture.
The Guadarrama is the mountain wall Madrid sees from its office towers: a sixty-kilometre granite and gneiss ridge separating the two Castilian plateaus, snow-covered enough of the year that Velázquez painted its white crest behind royal portraits. The national park, declared in 2013 after three decades of wrangling between two regions, takes the high country — the summit ridges around Peñalara, at 2,428 metres the roof of the range, its east face bitten by glacial cirques holding a chain of tarns that are the park's ecological jewel and a recovered one: a ski resort operated inside the Peñalara cirque until 1999, and its demolition and the lagoons' restoration is Spain's best small rewilding story.
The range's south-facing shock is La Pedriza, the largest granite boulder-field landscape in Europe — a mountainside of domes, pinnacles and hoodoos weathered into animal shapes, seamed with slab climbing routes and scrambling circuits, with griffon vultures nesting on El Yelmo's helmet dome. On the Segovian side the park's skirt is the Valsaín forest, the great Scots-pine woods that supplied the Spanish court's timber and now supply its capital's weekend oxygen; the fifteenth-century monastery of El Paular sits in the Lozoya valley between them, one Benedictine and several thousand picnickers strong on a Sunday.
No Spanish landscape carries more literary freight. The Guadarrama was the classroom of the Institución Libre de Enseñanza, whose pedagogues took Madrid's students walking here in the 1880s and invented Spanish mountaineering as a moral exercise; Machado versified the sierra, the Generation of '98 argued about Castile from its passes, and the civil war fixed it in world literature — the Navacerrada front is where Hemingway set For Whom the Bell Tolls. The fighting's bunkers still line the Fuenfría valley beside the genuinely Roman road that crossed the pass eighteen centuries earlier.
What's worth knowing before you go
This is the rare national park with suburban rail service: cercanías trains reach Cercedilla, and the little mountain line continues to Puerto de Navacerrada and Cotos, the trailhead for Peñalara — no car needed for the range's best day. La Pedriza is entered from Manzanares el Real, where the access road has a strict daily car quota; arrive by nine or walk in. Rascafría keys the Lozoya valley and El Paular. Summer weekends are Madrid en masse — go midweek, or in the shoulder seasons: June for the high meadows, late October for the Valsaín golds. Peñalara holds snow, and full winter conditions, well into spring; it kills unequipped hikers most years.
The connoisseur's day is the Cotos train up on a January weekday after fresh snow, skins or snowshoes to the Laguna Grande under Peñalara's frozen headwall, and chocolate at the Venta Marcelino among the ski-tourers — the Guadarrama as the Institución's pedagogues meant it.