Réunion's most famous - and only active - volcano is Piton de la Fournaise. Every second year or so it erupts, but it's impossible to predict. The outer crater is easy accessible, as you can drive all the way to the car park and viewpoint at Pas de Bellecombe (2311 m). The road is winding and narrow, but otherwise in good condition except for the last 4 km, which is a dirt road across an eeri moonscape. In the non-active periods it's possible to hike across the bottom of the outer crater and up to the viewpoint Balcon du Dolomieu (5 h return). During eruptions it's possible to see the spewing lava and lava flow either from the distance from the car park at Pas de Bellecombe or get closeup by walking along the outer rim to the viewpoint at Piton Kapor (3h return). If the volcano is erupting, come in the early afternoon, bring warm clothes and expect traffic jams up to the car park at Pas de Bellecombe.