Torres Grotto is the largest lava tube in Portugal, with a length of 5150 meters, and is part of the Lajidos Formation included in the volcanic mountain complex on the island of Madeira, and it is estimated that it was formed about 1500 years ago by a volcanic eruption that originated in Capico Bravo, and can be visited via a trip An exploratory allows viewing of different types of lava and many interesting geological formations.