The 10 Most Difficult Engineering Projects Ever Built

These are projects built in deserts, under oceans, inside mountains, in frozen wastelands, and even in orbit. They weren’t just constructed. They were fought for. Watch to the end to see which project ranks number one — and why its difficulty goes far beyond scale. ⏱️ Chapters 00:00 – Introduction 00:39 – No.10: The Leaning Tower of Pisa Stabilization Project 02:42 – No.9: The Panama Canal 04:35 – No.8: The Channel Tunnel 06:18 – No.7: The Three Gorges Project 07:59 – No.6: The International Space Station 09:31 – No.5: The Hong Kong–Zhuhai–Macao Bridge 10:53 – No.4: The Gotthard Base Tunnel 12:24 – No.3: The Trans-Siberian Railway 13:51 – No.2: The Suez Canal 15:05 – No.1: The Large Hadron Collider 16:36 – Eening