Sierra de Lújar from Castell de ferro

Sierra de Lújar from Castell de ferro is one of cycling's great tests — 31.3km of sustained climbing, gaining 1,982m from base to summit. The average gradient of 6.3% disguises ramps of 14.1% — the kind of gradient that turns plans into prayers. The 37 hairpin bends define this climb — each switchback a landmark, each straight a test of resolve. The road reaches 1,870m — high enough to feel the altitude on tired legs. Located in Andalusia, Spain.