Lascar is the most active volcano in the Atacama region, and one of the few where you can hike close enough to see into the crater. The route climbs from a high trailhead across loose volcanic rock, past sulphur vents and fumaroles that remind you the mountain is alive. The summit sits at around 5,592 metres. The trek is demanding: the altitude, the terrain, and the exposure all require good fitness and proper acclimatisation. But the views from the upper slopes are extraordinary: the crater steaming below, the altiplano stretching behind, and the Andes running in both directions. Your guide has experience on this mountain and will turn back if conditions require it.