Volcanospeleological Museum

Tucked inside the headquarters of the Montanheiros Association on Rua da Rocha, this niche museum is dedicated entirely to Azorean lava tube caves and volcanic speleology — a subject you won't find covered like this anywhere else. It showcases the unique geological formations born from Terceira's volcanic activity, with specimens and exhibits that reflect decades of real fieldwork by local cave explorers. Quietly fascinating, especially if you've ever wondered what's happening beneath the island's surface.