Episode 1
Return to the 57-kilometer long high-speed rail tunnel in Switzerland's Gotthard Mountain range to see what it will take to finish the project by 2017.
Episode 2
Returning to Tenerife to check on the world's best water park which now seems destined to remain dry after numerous problems.
Episode 3
Crews race against the clock to finish an important venue and signature landmark for the 2012 London Olympics.
Episode 4
Mega Builders return to Istanbul to update the Marmaray rapid-transit project, which continues to have delays.
Episode 5
Six years after piles were pounded into the muddy bottom of San Francisco Bay the new Bay Bridge is about to be topped off.
Episode 6
Inside a famous Swedish hotel which is constructed from 10,000 tonnes of ice and 30,000 tonnes of snow, and boasts a frozen bar and cinema screen.
