▲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.

▲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.

▲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.

▲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.

▲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.

▲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.

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

▲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.

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

▲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).

▲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.

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

▲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.

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

▲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.

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

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

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

▲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.

▲A 300-year-old beech grove known locally as the "Dark Hedges," this natural wonder is located near Stranocum Village.

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The Ocean Voyager exhibit tunnel at Georgia Aquarium in Atlanta.

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A tunnel on Mount Carmel Highway in Zion National Park in Utah.

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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.

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The Harbor Tunnel in Baltimore, which carries I-895.

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Mammoth Cave Canyon passage in Mammoth Cave, Kentucky. This is the world's longest cave.

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Sparkling Byron Glacier in Alaska features dozens of magnificent ice tunnels and caves that were formed by the receding glacier.

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The Canal de Bourgogne (Burgundy Canal) at Pouilly-en-Auxois passes through a tunnel that is 3,333 m (10,935 ft) long.

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The interior of the mighty 18th-century Águas Livres Aqueduct in Lisbon.

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The foot tunnel into King's Cross tube (metro) station in London.

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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.

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The 506-m (1,659-ft) Donner Pass Summit Tunnel in California was in service from 1868 to 1993. This image is a digital composite with the tracks restored.

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The minimalist interior of the TWA Flight Center at John F. Kennedy Airport in New York City.

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The deserted and spooky halls and tunnels of the former Eastern State Penitentiary in Philadelphia, Pennsylvania.

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Work continues on the Manhattan side of the East Side Access Project below Grand Central Terminal in New York City.

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The old Carrizo Gorge Railway line near San Diego disappears into a narrow tunnel.

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Once the world's largest-bore tunnel, the Yerba Buena Island Tunnel in San Francisco still impresses in size and structure.

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The mouth of the tunnel at Kyoto's Miho Museum.

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The underground walkway between the two buildings of the National Art Gallery in Washington, D.C.

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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.

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Tunnels leading into the vast belly of the Hoover Dam, on the Nevada/Arizona border.

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The Brunkeberg tunnel is one of the most photogenic spots in Stockholm. It is 231 m (758 ft) long and was built from 1884 to 1886 for pedestrians and cyclists.

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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.