Eisenerz Tunnel in Austria is the country's longest railway tunnel, connecting Selzthal and Trieben. It took six years to construct.
The Frejus Tunnel in France/Italy connects the two countries through the Alps and was constructed over seven years.
Zhongnanshan Tunnel in China is the longest tunnel in the country, situated in the Qinling Mountains, and took five years to build.
Laerdal Tunnel in Norway is the world's longest vehicular tunnel, connecting Laerdal and Aurland, and was built over five years.
The Sevgi Gonlum Tunnel in Turkey is the country's longest tunnel, connecting Istanbul and Izmir, and took nine years to complete.
The Guadarrama Tunnel in Spain is the longest tunnel in the country, connecting Madrid and Segovia, and was constructed over six years.
Lötschberg Base Tunnel in Switzerland is the second-longest tunnel in the country, connecting Frutigen and Raron.
Channel Tunnel, also known as the Eurotunnel, is an underwater tunnel connecting France and England, constructed over six years and is the busiest undersea tunnel in the world
The Seikan Tunnel in Japan connects the islands of Honshu and Hokkaido and is the longest undersea tunnel globally, taking 24 years to build.
Gotthard Base Tunnel in Switzerland is the longest and deepest traffic tunnel globally, cutting travel time in half and linking the north and south of Switzerland, with construction lasting 17 years.