Roman Aqueduct
Nothing prepares you for the scale. You step into the Plaza del Azoguejo and 167 granite arches rise above you, the double-tiered section reaching 28.5 meters overhead. Built around the 1st century AD, this structure carried water from the Sierra de Guadarrama to the city for nearly two millennia. Not a single drop of mortar holds it together. The stones stay in place through weight and precision alone, which is something you need to see up close to believe. It is free to visit and open 24/7. Walk to the Postigo del Consuelo stairs on the left side of the plaza for the best elevated angle, where you can see the original water channel running along the top. Then walk away from the city center along the aqueduct for about ten minutes to find where the arches shrink to eye level. The crowds are thickest here before noon. Head uphill from the plaza along Calle Real, the main commercial street, toward the Church of San Martin.
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