📜 Historic underwater tunnel in Rotterdam, opened in 1942. 🔍 Features a unique rectangular shape and separate levels for pedestrians, cyclists, and cars, stretching 1,373 meters. # Why Go 🚲 Experience biking or walking through Europe's longest underwater vehicle tunnel beneath the Maas River. 🏛️ Explore a national monument with unique rectangular design and antique wooden escalators. 📸 Capture creative photos of light, symmetry, and retro aesthetics. # Tips 🚶‍♀️ Consider a Gilde Rotterdam tour for behind-the-scenes access. 🤫 Visit during off-peak hours for a quieter experience. 📷 Bring your camera for creative shots. 💡 Check the Visitors Centre for historical information. # Hours 🕒 Daily, 24/7