The Caldeira of Faial is a natural reserve since 1972 (category I – IUCN). It’s a volcanic colapse crater with unique characteristics. The Caldeira of Faial descent is a special experience, so Faial Natural Park controls the access to the bottom, issuing a limited number of permits. Caldeira descent requires a certified guide. The Caldeira of Faial is one of the last strongholds for the Azores native forest. We can find there more than 60% of the Azores endemic species. It’s a place where you can feel how the Azores were like before human settlement. The trail is difficult because it is very narrow and steep. Sometimes some scramble is necessary. The Caldeira bio-diversity is composed of different humid habitats. Hence it’s frequent to find mud and a flooded area at the bottom.