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Tunnels

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Architecture, Nature and flora, Transportation

Big Dig

The Central Artery/Tunnel Project (CA/T), known unofficially as the Big Dig, was a megaproject in Boston that rerouted the Central Artery of Interstate 93, the chief highway through the heart of the city, into the 1.5-mile (2.4 km) Thomas P. O'Neill Jr. Tunnel. The project also included the construction of the Ted Williams Tunnel, the Leonard P. Zakim Bunker Hill Memorial Bridge over the Charles River, and the Rose Kennedy Greenway in the space vacated by the previous I-93 elevated roadway. Initially, the plan was also to include a rail connection between Boston's two major train terminals. Planning began in 1982; the construction work was carried out between 1991 and 2006; and the project concluded on December 31, 2007 when the partnership between the program manager and the Massachusetts Turnpike Authority ended.

Architecture, Nature and flora, Transportation

Houston tunnel system

The Houston tunnel system is a network of subterranean, climate-controlled, pedestrian walkways that links 95 full city blocks 20 feet (6 m) below Houston's downtown streets. It is approximately 6 miles (9.7 km) long. There are similar systems in Chicago, Dallas, Oklahoma City, Montreal and Toronto. The first link was built in the 1930s by Ross Sterling to connect two neighboring buildings he owned, inspired by the tunnel system at Rockefeller Plaza in New York City. Soon after, Will Horwitz, an entertainment entrepreneur, connected three of his vaudeville and movie theaters to save on air-conditioning. Architectural historian Stephen Fox has stated that the idea for the tunnel system came when the Bank of the Southwest Building was "linked by tunnel to the 1010 Garage and the Mellie Esperson Building" in 1961.

Architecture, Nature and flora, Transportation

Mont Blanc Tunnel

The Mont Blanc Tunnel is a highway tunnel in Europe, under the Mont Blanc mountain in the Alps. It links Chamonix, Haute-Savoie, France with Courmayeur, Aosta Valley, Italy, via European route E25, in particular the motorway from Geneva to Turin. The passageway is one of the major trans-Alpine transport routes, particularly for Italy, which relies on this tunnel for transporting as much as one-third of its freight to northern Europe. It reduces the route from France to Turin by 50 kilometres and to Milan by 100 km (60 mi). Northeast of Mont Blanc's summit, the tunnel is about 15 km (10 mi) southwest of the tripoint with Switzerland, near Mont Dolent.

Architecture, Nature and flora, Transportation

Dallas Pedestrian Network

The Dallas Pedestrian Network or Dallas Pedway is a system of grade-separated walkways covering thirty-six city blocks of downtown Dallas, Texas, United States. The system connects buildings, garages and parks through underground tunnels and above-ground skybridges. The network contains an underground city of shops, restaurants and offices during weekday business hours.

Architecture, Nature and flora, Transportation

Dartford Crossing

The Dartford-Thurrock River Crossing, commonly known as the Dartford Crossing and until 1991 the Dartford Tunnel, is a major road crossing of the River Thames in England, carrying the A282 road between Dartford in Kent to the south with Thurrock in Essex to the north. It consists of two bored tunnels and the cable-stayed Queen Elizabeth II Bridge. The only fixed road crossing of the Thames east of Greater London, it is the busiest estuarial crossing in the United Kingdom, with an average daily use of over 130,000 vehicles. It opened in stages: the west tunnel in 1963, the east tunnel in 1980 and the bridge in 1991. The crossing, although not officially designated a motorway, is considered part of the M25 motorway's route, using the tunnels northbound and bridge southbound. Described as one of the most important road crossings in Britain, it suffers from heavy traffic and congestion.

Architecture, Nature and flora, Transportation

Holland Tunnel

The Holland Tunnel is a vehicular tunnel under the Hudson River. It connects Manhattan in New York City, New York, to the east, and Jersey City, New Jersey, to the west. An integral conduit within the New York metropolitan area, the Holland Tunnel is operated by the Port Authority of New York and New Jersey (PANYNJ). The entirety of the tunnel carries Interstate 78; the New Jersey side also carries New Jersey Route 139.

Architecture, Nature and flora, Transportation

Lincoln Tunnel

The Lincoln Tunnel is an approximately 1.5-mile-long (2.4 km) tunnel under the Hudson River, connecting Weehawken, New Jersey on the west bank with Midtown Manhattan in New York City on the east bank. It was designed by Ole Singstad and named after Abraham Lincoln.

Architecture, Nature and flora, Transportation

Eisenhower Tunnel

The Eisenhower Tunnel, officially the Eisenhower–Edwin C. Johnson Memorial Tunnel, is a dual-bore, four-lane vehicular tunnel in the western United States, approximately sixty miles (97 km) west of Denver, Colorado. The tunnel carries Interstate 70 (I-70) under the Continental Divide in the Rocky Mountains.

Architecture, Nature and flora, Transportation

Gotthard Road Tunnel

The Gotthard Road Tunnel in Switzerland runs from Göschenen in the canton of Uri at its northern portal, to Airolo in Ticino to the south, and is 16.9 kilometres (10.5 mi) in length below the St Gotthard Pass, a major pass of the Alps. At time of construction, in 1980, it was the longest road tunnel in the world; it is currently the ninth-longest. Although it is a motorway tunnel, part of the A2 from Basel to Chiasso, it consists of only one bidirectional tube with two lanes. With a maximum elevation of 1,175 metres (3,855 ft) at the tunnel's highest point, the A2 motorway has the lowest maximum elevation of any direct north-south road through the Alps.

Architecture, Nature and flora, Transportation

Chenani-Nashri Tunnel

Chenani-Nashri Tunnel, also known as Patnitop Tunnel, is a road tunnel in the Indian state of Jammu and Kashmir on NH 44. The work was started in 2011 and was inaugurated on 2 April 2017 by Prime Minister Mr. Narendra Modi.

Architecture, Nature and flora, Transportation

Lærdal Tunnel

The Lærdal Tunnel is a 24.51-kilometre-long (15.23 mi) long road tunnel connecting Lærdal and Aurland in Sogn og Fjordane, Norway and located approximately 175–200 kilometres (109–124 mi) north-east of Bergen. It is the longest road tunnel in the world succeeding the Swiss Gotthard Road Tunnel. The tunnel carries two lanes of European Route E16 and represents the final link on the new main highway connecting Oslo and Bergen without ferry connections and difficult mountain crossings during winter.

Architecture, Nature and flora, Transportation

Alaskan Way Viaduct replacement tunnel

The Alaskan Way Viaduct replacement tunnel is a bored road tunnel that is under construction in the city of Seattle in the U.S. state of Washington. The 2-mile (3.2 km) tunnel will carry State Route 99 under Downtown Seattle from the SoDo neighborhood to South Lake Union in the north.

Architecture, Nature and flora, Transportation

East Side Access

East Side Access is a public works project under construction by the Metropolitan Transportation Authority (MTA) in New York City. It will bring the Long Island Rail Road (LIRR) into a new station built below, and connected to, Grand Central Terminal on the East Side of Manhattan. The new station and tunnels are expected to cost $11.1 billion and are tentatively scheduled to start service in December 2022.

Architecture, Nature and flora, Transportation

Detroit–Windsor Tunnel

The Detroit–Windsor Tunnel, also known as the Detroit-Canada Tunnel, is a highway tunnel connecting Detroit, Michigan, in the United States, with Windsor, Ontario, in Canada. It is the second busiest crossing between the United States and Canada.

Architecture, Nature and flora, Transportation

New York City water supply system

New York City's water supply system is one of the most extensive municipal water systems in the world. This complex system relies on a combination of aqueducts, reservoirs, and tunnels to meet the daily needs of New York City's more than eight million residents and its many visitors.