The Cathedral Grotto — which until 2022 was called the São Mateus Grotto — has a unique feature that no other grotto in the Bonito region offers: the entrance and exit are at different points in the cave. This means that you go through the entire interior without having to return the same way, and there is constant air circulation, making the environment much more ventilated than in other caves.

Just 4 km from Bonito, the tour begins with a suspended trail 5 meters high and 15 meters long, followed by a 280-meter hike up around the hill to the entrance of the cave. Inside the grotto, there is artificial lighting, and visitors are given a flashlight to supplement it. The route features stalactites, stalagmites, columns and coraloids, with the guide explaining the formations along the way.

The name Cathedral comes precisely from the cave's internal shape: its tall, elongated structure resembles the nave of a cathedral, which fully justifies the name change in 2022.

After the grotto, the tour includes a visit to the Kadiwéu Museum, which houses a collection of objects donated by local residents. There you'll find cars from the 1970s, historical items from Bonito and, on the second floor, an exhibition of stuffed animals. It's an extra layer of cultural context that most nature tours in Bonito don't offer.

Total duration: 1 hour 10 minutes. Easy difficulty level. Suitable for all ages from 5 years old.