Terceira is the site of four large volcanoes, grouped along a basaltic fissure zone that transects the island from northwest to southeast. The vestiges of the volcanic activities on the island assume peculiar and spectacular forms, such as at Algar do Carvão, a 90-metre deep volcanic chimney, formed approximately 3,200 years ago.
This cave is a 30-minute drive to the north of Angra do Heroísmo. This location is famous for its grottos that reach a depth of approx. 90-100 metres. In this magical subterranean world, which was once a volcanic vent, you’ll be dazzled by the remarkable silicate stalactites hanging from its arched roof.
Due to its peculiar characteristics, Algar do Carvão has been classified as a Regional National Monument. Access to the grotto has been facilitated by construction of new stairways (steep steps) and paths. Please note that there is a small fee charged for entrance to the cave.