Tunnels

thumb|right|Tunnel in Col du Galibier, France thumb|right|Tunnel in Fort de Mutzig, France thumb|Decorated portal to a road tunnel in Guanajuato, Mexico thumb|Utility tunnel for heating pipes between [[Rigshospitalet and Amagerværket in Copenhagen, Denmark]] thumb|Tunnel on the Taipei Metro in [[Taiwan]] thumb|Southern portal of the Chirk Tunnel|Chirk canal tunnel, Wales thumb|Victory Tunnel in [[Shimla, India was opened on 08 May 1945 after the Allied victory in World War II]] thumb|Atal Tunnel in [[Himachal Pradesh, India was opened on 4 October 2020 which connects Manali and Keylang, bypass

structures that allow animals to cross human-made barriers safely, typically bridges and tunnels

thumb|Stone culvert in Haapsalu, [[Estonia]] thumb|Steel culvert with a small plunge pool at its outflow thumb| Large box culvert on Rio Monterroso

tunnel exposing the Western Wall

foliage corridor

is a passage built underground or above ground to carry utility lines such as electricity, steam, water supply pipes, and sewer pipe

a tunnel that floats underwater, deep enough to avoid water traffic and weather

forced-air flow inside a tunnel caused by moving vehicles

secret subterranean passage used for the smuggling of goods and people

thumb|Zawar Kili village used by al Qaeda.

thumb|Entry to the Ratgöbluckn erdstall at Perg, Austria – its passages are high enough for tourists to access (electric lights since 2002)

vertical passages used in mines and tunnels to move fresh air underground, and to remove stale air