Levada Caldeirão Verde is a popular hiking trail located in the island of Madeira, Portugal. It's known for its natural beauty, including stunning waterfalls and lush vegetation.

The hike starts in the town of Santana and continues for about 8 kilometers (5 miles) along a narrow path carved into the mountainside. The path follows the course of a levada, which is a traditional irrigation channel used in Madeira for centuries. As you walk, you'll see lush forests, small farms, and terraced hillsides.

The highlight of the trail is the Caldeirão Verde waterfall, which cascades down a sheer rock face and into a deep pool. To reach the waterfall, hikers must pass through a long tunnel that was blasted out of the rock by hand. The tunnel is narrow and can be quite dark, so bring a flashlight.

The Levada Caldeirão Verde trail is considered moderately difficult and takes about 4 hours to complete round trip. It's best to start early in the day to avoid the midday heat and crowds. The trail is well marked and maintained, but can be narrow and steep in places, so wear sturdy shoes and be prepared for some uphill climbing.