Passo Giau (Giro d'Italia)
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The Angliru is widely touted as the toughest climb in pro cycling - but what else made our list? (pic: Sirotti)
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The peloton tackles the Wall of Sormano (pic: Sirotti)
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Colombians, Nairo Quintana and Rigoberto Uran do battle on the Zoncolan pic: ©Sirotti
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Christopher Horner rides alone after dropping Vuelta a Espana GC rival Vincenzo Nibali on the Angliru (pic: Sirotti)
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Peter Cossins' looks at 'cycling's greatest climb' in Alpe d'Huez (pic: Media-24)
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Froome rounds the final corner of the Mont Ventoux on his way to his 2013 stage win (pic: Sirotti)
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The iconic Passo dello Stelvio is likely to feature on the 'must ride' list of any cyclist. pic: ©Media24
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The Koppenberg is known to have forced many a cyclist to get off and push (pic: Sirotti)
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Alejandro Valverde celebrates his La Fleche Wallonne triumph atop the Mur de Huy in 2015 (pic: Sirotti)
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The snow-laden slopes of the Gavia featured at the Giro last year (pic: Sirotti)
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The Passo Giau is set in a landscape that can accurately be described as stunning. pic: ©Sirotti
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Joaquim Rodriguez resplendent in the maglia rosa at the 2012 Giro d'Italia, tackles the Mortirolo
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The Col du Tourmalet was part of the 2014 Etape du Tour (pic: muneaki / Creative Commons)
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Joaquim Rodriguez celebrates his win on the Ancares in 2012 (pic: Sirotti)
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Nairo Quintana and Pierre Rolland tackle the Montecampione at last year's Giro d'Italia (pic: Sirotti)
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The stunning backdrop masks the fierceness of the climb to the Lakes of Covadonga (pic: Sirotti)
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The Hautacam has become a popular modern addition to the Tour de France pic: ©Media24
