The world's most iconic tunnel megaprojects
Throughout history, much of the valuable infrastructure we depend on daily has been built underground to provide safe transport, drinking water and protection from natural disasters.
Read on to discover 20 of the world's most iconic tunnels that changed how people travelled and even lived, ranked by how much they cost to build.
All dollar amounts in US dollars. Pre-2022 project figures adjusted for inflation.
Nicole Robinson
11 June 2025
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