Segovia Aqueduct

The Aqueduct of Segovia strides straight into the old town like a Roman argument that never ended: raised around the late 1st or early 2nd century AD from granite blocks laid without a drop of mortar, its double tier of 167 arches reaches 28.5 metres above Plaza del Azoguejo and once carried water some 16 kilometres from the Rio Frio into the city. It is among the best-preserved Roman aqueduct bridges anywhere, and UNESCO inscribed it in 1985 together with the old town it serves - a hill of golden stone crowned by a late-Gothic cathedral and the Alcazar, the ship's-prow castle riding the ridge where two rivers meet. The genius is all in the joints: gravity and precision alone hold the arcade up, and standing beneath the tallest arches, watching the stones balance, remains one of Europe's great engineering encounters.

What you actually see

• The Azoguejo arches - the double arcade at its full 28-metre height.
• The dry granite joints - no mortar, only Roman precision, up close.
• The Alcazar - the ship's-prow castle at the old town's far end.
• The cathedral and lanes - the golden Gothic hill the aqueduct feeds.

When to go

Spring and autumn give the kindest light and temperatures; summer afternoons bake the plaza. Come early or stay past dusk, when the day-trip crowds thin and the arches are floodlit.

Honest expectations

Madrid day-trippers flood the square by late morning - the monument is free and always open, so beat them at breakfast. The climb to the viewpoint steps beside the arcade is short but steep. Segovia deserves an overnight: the aqueduct, Alcazar and roast-suckling traditions are one town ticket.

Nearby

Madrid, the royal gardens of La Granja de San Ildefonso and the Guadarrama mountains.