Terceira is a volcanic island in the Azores archipelago, formed by four overlapping stratovolcanoes built on a geological structure called Terceira Rift. It is the third-largest island of the archipelago and has its own international airport. The community of Angra do Heroismo, one of the three capitals, the oldest city of the Azores and UNESCO World Heritage is located here. Overlooking Angra do Heroismo is Mount Brazil, the remains of a long-extinct volcano with stunning views at the top. Serra de Santa Barbara, the highest point on the island at 1021 meters elevation has also impressive views in every direction. Probably the biggest highlight of this city is Algar do Carvão a unique volcanic chimney formed by two major eruptions 1000 years ago and one of the few volcanoes in the world that can be visited.