Sete Cidades, a twin-lake village on the north coast of São Miguel Island, is a geological and ecological wonder that has fascinated people since centuries. The village is situated in a massive volcanic crater, approximately 500 meters above sea level, and is surrounded by lush green forests and picturesque lakes. The crater is home to two stunning lakes, Lagoa Azul (Blue Lake) and Lagoa Verde (Green Lake), which are separated by a narrow isthmus and are renowned for their striking color contrast. From a geological perspective, Sete Cidades is a prime example of a caldera, a depression formed by the collapse of a volcano following a volcanic eruption. The caldera's unique shape and structure have been shaped by millions of years of volcanic activity, erosion, and sedimentation. The lakes themselves are a result of the accumulation of rainwater and groundwater in the caldera, which has created a unique and fragile ecosystem. Ecologically, Sete Cidades is a biodiversity hotspot, with a wide range of flora and fauna that are endemic to the Azores. The lakes and surrounding forests are home to several species of birds, including the Azores Bullfinch and the Monteiro's Storm-Petrel, which are found nowhere else in the world. The forests are also dominated by native tree species that are well adapted to the mild and humid climate of the island. In addition to its natural beauty and scientific significance, Sete Cidades has played an important role in the history and culture of the Azores.