The Angliru is widely touted as the toughest climb in pro cycling - but what else made our list? (pic: Sirotti)

The peloton tackles the Wall of Sormano (pic: Sirotti)

Colombians, Nairo Quintana and Rigoberto Uran do battle on the Zoncolan pic: ©Sirotti

Christopher Horner rides alone after dropping Vuelta a Espana GC rival Vincenzo Nibali on the Angliru (pic: Sirotti)

Peter Cossins' looks at 'cycling's greatest climb' in Alpe d'Huez (pic: Media-24)

Froome rounds the final corner of the Mont Ventoux on his way to his 2013 stage win (pic: Sirotti)

The iconic Passo dello Stelvio is likely to feature on the 'must ride' list of any cyclist. pic: ©Media24

The Koppenberg is known to have forced many a cyclist to get off and push (pic: Sirotti)

Alejandro Valverde celebrates his La Fleche Wallonne triumph atop the Mur de Huy in 2015 (pic: Sirotti)

The snow-laden slopes of the Gavia featured at the Giro last year (pic: Sirotti)

The Passo Giau is set in a landscape that can accurately be described as stunning. pic: ©Sirotti

Joaquim Rodriguez resplendent in the maglia rosa at the 2012 Giro d'Italia, tackles the Mortirolo

The Col du Tourmalet was part of the 2014 Etape du Tour (pic: muneaki / Creative Commons)

Joaquim Rodriguez celebrates his win on the Ancares in 2012 (pic: Sirotti)

Nairo Quintana and Pierre Rolland tackle the Montecampione at last year's Giro d'Italia (pic: Sirotti)

The stunning backdrop masks the fierceness of the climb to the Lakes of Covadonga (pic: Sirotti)

The Hautacam has become a popular modern addition to the Tour de France pic: ©Media24