The wall walk. The adarve path along the battlements — river on three sides, Somosierra on the horizon. The coracha tower and clock-gate are the highlights.
Museo Picasso — Colección Arias. Sixty-plus works dedicated to his barber and friend over 26 years of exile haircuts — free, and genuinely moving.
Walls, bridge & the Lozoya bend — 4 km · 1.5 h. Puerta del Piloncillo → full adarve wall circuit → down to the old bridge → the riverside path around the meander for the classic across-the-water view of the whole walled town. Short, and entirely photogenic.
The river beach. The Lozoya's dammed pool below the walls — official summer swimming with the battlements as backdrop.
Sierra del Rincón & Montejo's beech wood. The UNESCO biosphere reserve up the valley — the Hayedo de Montejo's ancient beeches (book the guided entry) blaze copper in late October.
Sleeping here? Inside the walls if you can — a handful of small lodgings put the wall-walk and castle at your doorstep. The new town across the bridge has the practical hostals and bar life. For silence, casas rurales in the hamlets up the valley are minutes away.
Curated picks are coming — meanwhile, the live search covers every bookable property at the same price or better.