One of the nation's most scenic tunnels can be found in Utah. The Zion-Mount Carmel Tunnel on the highway between Utah's Zion National Park and and Bryce Canyon National Park includes a series of "windows" in the sandstone walls, allowing drivers to look out over some pretty spectacular vistas. Don't forget to watch the road!
The main purpose of any tunnel is to get you from Point A to Point B quickly, and the people behind the Bund Sightseeing Tunnel in Shanghai wanted to make the journey across – or rather below – the Huangpu River. This rather bizarre tourist attraction transports guests in automated cars through a tunnel filled with LED lights, strange audiovisual effect and deep voices speaking foreboding words, like "hell" and "magma."
Norway has the destinction of having the world's longest completed road tunnel, the Laerdal Tunnel that passes through 15 miles of mountainous terrain.The engineers who created the tunnel didn't want to subject drivers to 20 minutes of boredom, so they divided the tunnel into several sections, each with its own lighting and subtle curvature to keep drivers engaged.
In the early days of Sequoia National Park's existence, park officials created two tree tunnels – one you can walk through and another you can drive through – in an effort to bring more visitors to the park. It worked, and every year hundreds of cars pass through a "tunnel" carved from a giant 2000-year-old Sequoia tree that fell across Crescent Meadow Road in 1937.
The Large Hadron Collider might just be the world's most scientifically important tunnel. The 17-mile-long tunnel sits more than 500 feet beneath the surface of Geneva, Switzerland and serves as the laboratory for scientists studying the field of particle and high-energy physics.
The Yerba Buena Island Tunnel in San Francisco certainly isn't the world's longest, but it remains the widest single bore tunnel in the world more than 75 years after it was built. The 76-foot-wide tunnel carries five lanes of traffic in each direction. The designers of the tunnel decided that it would be cheaper to cut through the small island in the San Francisco Bay than to build one giant bridge across it.
The Channel Tunnel, or Chunnel as it's often referred to, is the world's longest international tunnel and connects London with France by passing beneath the English Channel. The 31.3-mile passage also contains the largest vehicle transport in the world in the form of the Eurotunnel Shuttle. At its deepest, the Channel Tunnel sits 250 feet below sea level.
The Tokyo Bay Aqua-Line combines a 6-mile tunnel with a 3-mile-long bridge feeding into it, but perhaps its most interesting feature is the giant rest stop perched on top of it, complete with shops, restaurants and an observation deck where drivers can get out and stretch their legs before entering the tunnel. The entire system took more than three decades to design and construct.
The Sagano Bamboo Grove in Kyoto is considered one of the world's most beautiful "tree tunnels," and for good reason. Located in the Arashiyama neighborhood, this 1000-foot-long path winds through densely planted bamboo trees, perfect for a peaceful walk or bike ride.
Hezekiah's Tunnel, also called the Siloam Tunnel, was dug beneath the City of David in Jerusalem as early as the eighth century BCE, making it one of the world's oldest known tunnels. A set of steps lead down into the tunnel, where visitors pass through knee-high water to the Pool of Siloam, Jerusalem's only natural spring.