This is thematic tour about caves and volcanoes at Terceira island. Climb to Serra do Cume and be amazed by the beauty of the largest crater in the Azores; visit algar do carvão, and explore the inside of an empty volcano, one of the most beautiful natural monuments of the island; walk around a fumarolic field in Furnas do Enxofre; visit gruta do natal and explore a basaltic lava tunnel; climb to Serra de Santa Bárbara and be surprided by the view from the top of the tallest mountan of the island , where from there you can sight islands from the central group (São Jorge, Pico and Graciosa).