S2 E1 • The Gotthard Tunnel

Constructing the Gotthard Base Tunnel in Switzerland, the longest rail tunnel in the world, running for 57 kilometres through the Alps.

S2 E2 • Orion Space Craft

The spacecraft designed for the first manned mission to Mars, planned to launch by 2035, which requires the most powerful rocket ever built and a specially designed crew module.

S2 E3 • Three Gorges Dam

The Three Gorges Dam, built across China's Yangtze river, which is the largest and heaviest concrete structure ever built, housing the world's largest power station.

S2 E4 • Millau Viaduct

The Millau Viaduct in South West France, which is the tallest bridge in the world and stretches two and a half kilometres over one of Europe's deepest valleys.

S2 E5 • AT&T Stadium

A colossal American football stadium in Texas, that features the world's largest retractable roof and is able to seat over 100,000 spectators with no restricted viewpoints.

S2 E6 • Oasis Class Cruise Ships

Examining a fleet of cruise ships that are the largest passenger vessels in the world, and revealing how they have built on 19th-century experiments in hydrodynamics.

S2 E7 • The Shard

The construction of London's Shard, revealing how it was influenced by the Milan Metro, concrete grain storage in Minnesota and a lifting mechanism in the Venice shipyards.

S2 E8 • Virginia Class Submarine

A look at the US navy's most advanced nuclear submarine - which can remain underwater for months at a time - examining the previous vessels that influenced it.