The most amazing tunnels in the world -

Rail tunnels, road tunnels, underground passageways, and subways... These long, narrow, man-made marvels of civil engineering are a vital part of everyday infrastructure. But tunnels can also be formed naturally, enhancing the landscape with beautiful and fascinating landmarks. 

Browse this gallery for a tunnel vision portfolio that will leave you astonished.

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Norway - Norway's fabulously illuminated Laerdalstunnelen is the longest road tunnel in the world. At nearly 25 km (15.5 mi) long, the colorful tunnel connects the municipalities of Lærdal and Aurland.

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Hungary - Framed in the entrance of the Buda Castle Tunnel at sunrise is Budapest's landmark Szechenyi Chain Bridge and Gresham Palace.

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Iceland - The magical Ice Cave Tunnel carved into Iceland's massive Langjökull Glacier allows visitors to appreciate one of the country's greatest natural wonders.

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India - Appearing as if part of a man-made defensive structure, this tunnel is located on the Lachung La Pass. (Photo: Flickr/CC BY-NC-ND 2.0)

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USA - The stunning Rainbow of Lights tunnel greets passengers heading for Detroit airport's McNamara Terminal.

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Belgium - Inside one of the giant tubes of the landmark Atomium, located in Brussels. (Photo: Flickr/CC BY 2.0)

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Ukraine - Seeking romance? Head for the beautiful tree-lined tunnel of love, in fact a railway line near Klevan surrounded by lush, green arches where couples often take walks.

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China - One of the region's most exciting visitor attractions, the Bund Sightseeing Tunnel in Shanghai is a veritable psychedelic tourist trap. Enjoy your trip!

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Denmark - Located in the historic center of Copenhagen is this tunnel complex found within the old Citadel. (Photo: Flickr/CC BY-NC 2.0)

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England - The foot tunnel into King's Cross tube (metro) station in London. (Photo: Flickr/CC BY-NC-ND 2.0)

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Canada - The fascinating Data Net Interior exhibit at Ottawa's Science Museum. (Photo: Flickr/CC BY-NC 2.0)

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China - Carved along the side and through the Taihang Mountains, the Guoliang Tunnel was created without modern power tools. Instead, villagers undertook its construction using mainly hammers and chisels.

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USA - The 506-m (1,659-foot) Donner Pass Summit Tunnel in California was in service from 1868 to 1993. This image is a digital composite with the tracks restored.  (Photo: Wikimedia/CC BY-SA 3.0)

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Japan - The exquisite Fushimi Inari-taisha shrine in Kyoto features many rows of tori gates (pictured). Nearly 1,000 tori gates decorate the shrine's main path.

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France - A tunnel in the 19th-century Kaiser Wilhelm II fortress, these days better known as Fort de Mutzig. (Photo: Wikimedia/CC BY 3.0)

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USA - The minimalist interior of the TWA Flight Center at John F. Kennedy Airport in New York City. (Photo: Flickr/CC BY-NC-ND 2.0)

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Denmark - A utility tunnel for heating pipes between Rigshospitalet and Amagerværket in Copenhagen. (Photo: Wikimedia/CC BY 3.0)

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England - The players' tunnel at Stamford Bridge stadium, home to London's Chelsea soccer club.

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USA - Look carefully. The Mount Rushmore Monument can be seen at the end of this tunnel on the Iron Mountain Road (US 16A) in South Dakota. (Photo: Flickr/CC BY-SA 2.0)

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France - The Canal de Bourgogne (Burgundy Canal) at Pouilly-en-Auxois passes through a tunnel that is 3,333 m (10,935 ft) long. (Photo: Flickr/CC BY-NC 2.0)

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USA - This is the tunnel visitors enter for the start of the indoor Space Mountain roller coaster ride at Walt Disney World in Orlando, Florida. (Photo: Flickr/CC BY-NC-ND 2.0)

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Portugal - The interior of the mighty 18th-century Águas Livres Aqueduct in Lisbon. (Photo: Flickr/CC BY-NC 2.0)

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USA - The Ocean Voyager exhibit tunnel at Georgia Aquarium in Atlanta. (Photo: Wikimedia/CC BY-SA 4.0)

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USA - The Harbor Tunnel in Baltimore, which carries Interstate I-895. (Photo: Wikimedia/CC BY-SA 2.5)

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Japan - Tokyo Bay Aqua-Line is an expressway that's made up of a bridge–tunnel combination. Connecting Kawasaki City with Kisarazu City, the Aqua-Line transforms from a tunnel to a bridge on Umihotaru Island. (Photo: Wikimedia/CC BY 4.0)

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Switzerland - Inaugurated in 2016, Gotthard Base Tunnel is the world's longest railway tunnel. The lines arrow through the Swiss Alps and boast a route length of 57 km (35 mi).

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England - Sheep creeps are purposely constructed gaps in the base of drystone walls that allow sheep to pass from field to field. (Photo: Wikimedia/CC BY-SA 4.0)

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Australia - Traveling the Northbound tube through the Airport Link Tunnel in Brisbane. (Photo: Flickr/CC BY-SA 2.0)

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USA - Sparkling Byron Glacier in Alaska features dozens of magnificent ice tunnels and caves that were formed by the receding glacier. (Photo: Flickr/CC BY-NC 2.0)

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USA - Mammoth Cave Canyon passage in Mammoth Cave, Kentucky. This is the world's longest cave. (Photo: Wikimedia/CC BY-SA 2.5)

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Argentina - Below Buenos Aires is the mysterious tunnel of El Zanjón, believed to date back to around 1780. (Photo: Flickr/CC BY-NC 2.0)

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Northern Ireland - A 300-year-old beech grove known locally as the "Dark Hedges," this natural wonder is located near Stranocum Village. (Photo: Flickr/CC BY-ND 2.0)

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USA - A tunnel on Mount Carmel Highway in Zion National Park in Utah. (Photo: Flickr/CC BY 2.0)

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Switzerland - The Vals-Rothenberg Tunnel, pictured near completion. (Photo: Flickr/CC BY 2.0)

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Japan - The mouth of the tunnel at Kyoto's Miho Museum. (Photo: Flickr/CC BY-NC-ND 2.0)

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USA - The underground walkway between the two buildings of the National Art Gallery in Washington, D.C. (Photo: Flickr/CC BY 2.0)

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Sweden - The Brunkeberg tunnel is one of the most photogenic spots in Stockholm. It is 231 meters long and was built from 1884 to 1886 for pedestrians and cyclists. Photo: Flickr/CC BY-NC 2.0)

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USA - Tunnels leading into the vast belly of the Hoover Dam, on the Nevada/Arizona border. (Photo: Flickr/CC BY-NC-ND 2.0)

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Italy - The graffiti translates as "you and me, together forever" in this subway tunnel in Vignola. (Photo: Flickr/CC BY-NC-ND 2.0)

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England - Opened in 1904, the Greenwich foot tunnel crosses beneath the River Thames and links the London borough of Greenwich with the city's Docklands district.

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USA - A service tunnel in an abandoned steel mill in Pennsylvania spray painted with a new lease on life. (Photo: Flickr/CC BY-NC 2.0)

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USA - Work continues on the Manhattan side of the East Side Access Project below Grand Central Terminal in New York City. (Photo: Flickr/CC BY 2.0)

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Gibraltar - Around 55 km (34 mi) of tunnels are found within the Rock. Some date back to the late 18th century. A number are open to the public.

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Philippines - A 55-m (180-ft) 200-degree curved walkway tunnel is the highlight of the Manila Ocean Park, which affords visitors amazing sealife views.

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USA - A former service tunnel in Sausalito, California painted up, brick by brick, in bright colors. (Photo: Flickr/CC BY-NC 2.0)

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Brazil - A natural verdant tree tunnel enhances Rua Gonçalo de Carvalho in the city of Porto Alegre. (Photo: Wikimedia/CC BY-SA 3.0)

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USA - The old Carrizo Gorge Railway line near San Diego disappears into a narrow tunnel. (Photo: Flickr/CC BY 2.0)

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Japan - An underpass near Tokyo's Heiwajima railway station glows eerily as evening falls. (Photo: Flickr/CC BY 2.0)

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Italy - This is one of the oldest tunnels in the world! Built on the orders of the Roman emperor Vespasian, it facilitates passage on the ancient Roman road Via Flaminia, which snakes through the Furlo Pass. (Photo: Wikimedia/CC BY-SA 2.5)

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England - Roofed and walled in stone, the amazing underground complex of tunnels and passages known as Halliggye Fogou in Cornwall date back to the Iron Age. (Photo: Flickr/CC BY-NC 2.0)

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USA - Once the world's largest-bore tunnel, the Yerba Buena Island Tunnel in San Francisco still impresses in size and structure. (Photo: Wikimedia/CC BY-SA 2.0)

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England - The Channel Tunnel, also referred to as the Euro Tunnel, is the only fixed link between the island of Great Britain and the European mainland. Opened in 1994, the rail tunnel is 50 km (31 mi) long.

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China - The Andong Tunnel, constructed by the Chinese People's Liberation Army in the 1970s, is now part of the Matsu National Scenic Area and open to the public.

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USA - Much photographed and admired, the Oak Alley Plantation House in Louisiana appears as a historic point of focus through the trees.

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Republic of China (Taiwan) - The 700-m (2,296-ft) Beihai Tunnel runs from the Tieban coast into channels carved underneath Nangan. Pleasure boat rides ply its crystal-clear waters.

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India - Glowing under warm illumination, the Revoli Tunnel at Lower Bazaar is an underground passageway located in the heart of Shimla, a bustling city in the country's Himachal Pradesh state.

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Vietnam - Not for the claustrophobic, the Cu Chi tunnel complex in Ho Chi Minh City offers a fascinating glimpse into the way Viet Cong forces operated below ground during the Vietnam War.

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USA - The deserted and spooky halls and tunnels of the former Eastern State Penitentiary in Philadelphia, Pennsylvania. (Photo: Flickr/CC BY-SA 2.0)

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Japan - A train approaches Tappi-Kaitei Station in the Seikan Tunnel, the second-longest mainline railway tunnel after Switzerland's Gotthard Base Tunnel. Tappi-Kaitei is now closed. (Photo: Wikimedia/CC BY 3.0)

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