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This is the famous climb to the Passo del Mortirolo from Mazzo di Valtellina. Lance Armstrong and Mark Canvedish marked this climb as one of the most difficult ones they ever did.
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<p><a class="routeYou_embed" href="https://app.routeyou.com/en-it/route/view/1304271?utm_source=embed&utm_medium=article&utm_campaign=routeshare&navigation=external" title="Climb to the Passo del Mortirolo - RouteYou" target="_blank"><img src="https://image.routeyou.com/embed/route/960x670/1304271-en@2x.png" style="width: 100%; height: auto;" alt="Climb to the Passo del Mortirolo"></a></p>
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