📜 Man-made funnel and tunnel in Lagoa da Serra da Estrela, built in 1955 for a hydroelectric dam. 🔍 Located at 1500m height in Serra da Estrela Natural Park, 7 km from Sabugueiro. # Why Go 🌊 Surreal opening looks like a portal to another dimension. ⚙️ Wonder of engineering, balancing human intervention and nature. 🏞️ Breathtaking landscapes with blue lagoons and granite boulders. 🌿 Lavish biodiversity around the funnel mouth. 🚶‍♀️ Unique hiking destination # Why Avoid 🚶 Long 10 km round trip hike, rocky sections, strong winds, no shade. 🧭 Path is unsigned, GPS tracking advisable, mountain weather changes rapidly. 🏙️ Far from any big city. # Tips 💧 Bring plenty of water and good shoes. 🗣️ Inform someone about hiking plans, mountain weather changes rapidly. 🧺 Consider bringing a picnic. # 🅿️ Parking Available at Lagoa Comprida