One of the biggest reserves of natural gas in the world is in the Arctic Circle, and getting to it requires a state-of-the-art gas refinery that's being constructed in Spain. Transporting this massive structure over 3,000 miles will prove to be an epic engineering challenge.
Mexico needs energy to fuel it's growing economy and has one of the largest dam building programs in the world, and the biggest of these is the El Cajon Dam. It will be the highest rock-filled dam in the world, but construction is up against a deadline and they're running out of time.
The Woodrow Wilson Bridge has spanned the Potomac River since the 1960s and it's proving inadequate for the demands of today's traffic. A replacement is being constructed and it's a feat of engineering, featuring seven additional miles of roadway to connect Virginia and Maryland.
The longest cable car lift in the world is being constructed on Lantau Island, in Hong Kong. It's being built by one of the world's finest cable car construction teams and has to withstand landslides and typhoons, but the grand opening is only 9 months away and the project is behind schedule.
Ski Dubai aims to offer the seemingly impossible dream of snow skiing in the desert. When complete, it will be the largest indoor ski resort in the world. Construction crews face the monumental challenge of building this incredible structure on time and on budget.
The Gotthard Base Tunnel is set to become the longest and deepest tunnel in the world, creating rail travel through the Alps. With breakthrough engineering methods, it's undoubtedly one of the most ambitious construction projects ever attempted.