The user is asking about a specific levada walk in Madeira - the Levada do Caldeirão Verde / Caldeirão do Inferno. This is a hiking trail question, so I should use the `find_hikes` tool to get the official information about this trail, including its current status, difficulty, distance, etc. I'll also check for curated videos of this trail to give a visual sense. Let me search for this trail using find_hikes, and also find curated videos.The user asked about "Levada do Caldeirão Verde - Caldeirão do Inferno" levada walk. Let me look at what I got: 1. **Official PR trail**: PR 9 — "Levada do Caldeirão Verde" with route "Queimadas – Caldeirão Verde – Caldeirão do Inferno" 2. **Community trail**: There's a specific AllTrails route named "Levada do Caldeirão Verde - Caldeirão do Inferno" which is an unofficial community route. The user specifically named the "Caldeirão Verde - Caldeirão do Inferno" route, which maps to BOTH: - The official PR 9 trail (route: Queimadas – Caldeirão Verde – Caldeirão do Inferno) - A community AllTrails route with that exact name (17.4 km, out and back) Let me focus on the official PR 9 trail as the primary answer, since the route name matches it, and also mention the community route variant. **Official PR 9 — Levada do Caldeirão Verde:** - PR code: PR 9 - Route: Queimadas – Caldeirão Verde – Caldeirão do Inferno - Distance: 8.7 km (+ 8.7 km return) = ~17.4 km round trip - Difficulty: Moderate (IFCN) / Moderate (AllTrails says moderate too) - Duration: 6:30 hours - Start: Queimadas Forest Park - End: Caldeirão do Inferno - Max altitude: 1,020 m - Min altitude: 872 m - Access fee: €4.50 (visitors > 12 years), free for ≤ 12 years; Parking €2.00/hour - Managing entity: IFCN - AllTrails: 4.6★ from 4,562 reviews - Status: Not specified in this result (the note says this is evergreen and status is deliberately omitted, so I should tell the user to check current status) The community trail with the exact same name "Levada do Caldeirão Verde - Caldeirão do Inferno" shows: - 17.4 km, out and back, hard difficulty, 9.5-10.5 hr, 4.6★ from 531 reviews This is essentially the same physical walk as PR 9 (the full out-and-back), just mapped independently on AllTrails. I should present the official PR 9 trail as the authoritative answer, and note the community mapping as supplementary. The route goes from Queimadas Forest Park in Santana, following the levada through lush laurel forest, through tunnels carved in rock, past waterfalls, to the stunning Caldeirão Verde waterfall and further to Caldeirão do Inferno. Let me also note there are photos from walkmeguide.com. I need to note that the status may change, so the user should check current status before going.