Costing more than €12 billion, this monumental project has reshaped Europe’s transport network: the longest railway tunnel ...

From Japan's high-speed Shinkansen tunnels to Switzerland's record-breaking Gotthard Base Tunnel, these mega-tunnels ...

Tunnels are used to carry traffic through some of the most extreme terrain on the planet and they help ease journeys with reduced travel time. While most tunnels offer a short underground burst of ...