Several Madeira hikes pass through tunnels, adding a memorable extra element to the adventure. PR9 Levada do Caldeirão Verde is particularly famous for its series of tunnels, while PR1 Vereda do Areeiro also includes tunnels on its dramatic mountain route. If you plan to hike a route with tunnels, bring a headlamp or torch, wear suitable footwear and be prepared for wet, uneven and sometimes slippery surfaces.