– In the afternoon, after a picnic lunch, the adventure continues. Provided with helmets and flashlights, we will join a guided tour through Portugal’s longest lava tube: Gruta das Torres. It is about 5,150m long (3,2 miles).

– This tube exists for about 1,500 years and was created during an eruption coming from Cabeço Bravo.

– The guided tour to the cave lasts about 1 hour. There, you will be able to observe different geological formations. For example, stalactites and stalagmites, side benches and lava balls, and so much more.