The Gotthard Base Tunnel is the longest tunnel in the world

The Gotthard Base Tunnel is the longest tunnel in the world, extending an impressive 57 kilometers (approximately 35 miles) from Switzerland to Italy.

This engineering feat was built beneath the Swiss Alps and took 17 years to complete, officially opening in 2016. It is not only the longest but also the deepest traffic tunnel globally, reaching depths of up to 2,300 meters (7,500 feet) below the mountain peaks. The tunnel significantly shortens travel time between northern and southern Europe, making it an essential component of the continent's transportation infrastructure.