The Mistérios Negros trail in Terceira's Natural Park is a challenging yet rewarding hike that takes you through stunning landscapes of volcanic rock formations and lush vegetation. Starting near Lagoa do Negro, the circular route offers panoramic views of Pico Gordo and Pico do Gaspar, showcasing the island's central massif. Along the way, hikers can explore small lakes, endemic flora, and even visit the Gruta do Natal lava tunnel. With a mix of rugged terrain and scenic beauty, this trail is a must-do for nature enthusiasts looking for an adventure in the Azores.